There's No Lab Like 127.0.0.1

Posted on Aug 15, 2026

So you’ve decided to set up a homelab. It’s a big undertaking. It can be bigger or smaller, depending on your appetite for complexity. I’m working on a few objectives that I’ll be filling out as we go along, but it’s a fairly broad example of a homelab compared to what someone in an Enterprise would cover as their responsibilities in an engineering/admin role. I see this an accept it, but I’m also having fun.

Table Of Contents

Ain’t No Party Like A Network Party

I’m building out a small physical network. The last time that I had a physical network lab, I was an undergrad taking Eric Johnson’s CNT-4504 class in the mid 00’s. Some of the gear I have is from that era, but it should be serviceable enough. I don’t know that I still have copies of my work anymore, but I can look around.

The aim is to think multidimensionally. I’ve had a lot of experience working across teams, with some really great collaborators, but one thing that I noticed always helped me, as an engineer or a manager, was having curiosity, and some knowledge, about what’s going on over in the proverbial neighbor’s yard. I’m a fan of what I have foolishly (and likely incorrectly) called Gestalt IT for a long time. We are working in a web of relationships (personal, professional, and technical) with other people and teams, and understanding that and how it affects the present moment is really important to find the best way to help move everyone forward.

Starting From The Bottom

Well, before you even start from the bottom you start with some ideas. The ideas might be a bit too much to get through in one sitting, but they’re good to start with. I’m building an enclave within my ISP-provided home network that will house various applications and services. Which ones, you ask? Well, DNS and DHCP are pretty straightforward ones. I’ll have a wireless AP so that I can get the kiddos on the network and interact with Lila or Razzia easily enough.

I’m looking to have Wazuh doing some SIEMing. I’m going to have an Active Directory, as that’s one of the places where my bread is buttered. Keycloak for IAM. Horilla or OrangeHRM as a model human resources system. I’ll make the integrations. It’ll all line up. It’ll be fun! Maybe even Bar Assistant for some S’s and G’s.

I’ve got a good idea of how I want information to flow, and I’m wanting to model that out. you’ll be hearing more about it on this site, for sure.

And What Army

I do like a bit of kit. I’m not going to lie about it. Right now I’ve got an OptiPlex 7040 mini that I got off lease running Fedora 44. That’s the workstation I’m typing this on right this second, and it’s going to live inside the homelab network. This is my base of operations.

I’ve got a Mikrotik RB4011iGS+ router. That’s 10 GigE ports and one 10G SFP+. It’s a fun one. The documentation for Mikrotik sometimes reads like a backwards tax code. We’ll make it through, though. I’ve also got a hAP ac2, a mesh’s worth of Mikrotik Audience APs, and an RB260GS running SwitchOS. I’ve also got an old Apple Airport Extreme that I’ve got joined to my IoT network as a client.

But then there’s the Cisco stuff. Josh Rivera preserved this gear for me, and it’s coming out to play. One Cisco 2612, and two Cisco Catalyst 2950s. Yes, I could probably do much better in GNS3, but I do like some hardware. I like a patch cable. I’m OK with a little bit of fan noise. These units aren’t particularly power hungry, so they don’t contribute too much to the heat. The heat comes from the boxes. If I do come across any issues, that’s ok. No one is in production here, and I have enough ports to manage everything I would actually want to ensure uptime for. Also, the 2612 has a token ring interface and I think that’s cool. It might take me down a dark road, but it’s cool.

The Map Is Not The Territory

The RB4011 will be the edge for this network, mainly because it’s got GigE ports to spare and I do hate waiting for a download. Port 1 will be the uplink to “the Internet”. Ports 2, 3, 4, and 5 will be heading out to distro networks. I’m using ports 6-10 for setup purposes. These will be maintenance purposes for now. I don’t have anything for the SFP at the moment.

You might be wondering why there’s so many distro networks. I don’t have that many switches or routers. But what I do have, is hypervisors. In the last iteration of this homelab, I had an OPNsense VM fronting the virtual network on a hypervisor. It worked out decently well, as it was just a better-contained version of this experiment, but it lacked some feeling. It lacked some edge.

First Thing’s First

RouterOS comes with some pretty sane default configs, and I’ve got ether1 as my WAN port. Interfaces ether6-10 are on a bridge, and that’s going to be like my core network, for the time being. I’ve got my workstation, fedora, on there and I’ll have the management interfaces of my hypervisors there as well. I’ve also got pi1, a pi-hole, as DNS. Really, just because I wanted to see how it would work, and so far it’s working great. In the future I’m going to integrate it further into the environment, but for the time being we’re fine. It’s resolving and blocking and that’s all I really need. ether2-5 will be the distribution networks. This will likely change in the future, as I experiment more, but for now this is how it’s going.

I Find Your Lack Of Access Disturbing

Yes, the idea is to have this network isolated, and to strictly control what can get to the other areas of the home network, but I do want, for convenience sake, to have a way in. That way is, obviously, a VPN solution. Mikrotik’s RouterOS comes with a few out of the box, so there’s no need to stand up another VM or Pi or appliance or what-have-you. I’m doing just fine complicating my life–I don’t need additional help.

Many of the VPN guides just… don’t work. I don’t know if it’s that I’m doing this on a 4011 or what, but my situation is a bit unique and I’ve had to adapt. In the Quick Set menu of WinBox, there is a VPN access check box that, if exposed to the internet, will give you VPN access through a hostname set by Mikrotik. I don’t love this idea, and my 4011 is not exposed to the internet, so this is useless to me. Or is it?

Casting Wall of Fire

Not a 4th-level evocation, but a critical tool for managing access to your network. RouterOS has a firewall built in that is capable, and one must need to know this to get VPN working. Enabling the VPN server, and performing the configuration, won’t autoconfigure any of the firewall rules. It makes sense, 1000%, but none of the documentation or configuration guides for VPN that I came across mentioned it so I’m going to call it out here.

When you use the Quick Set checkbox for VPN, there are 4 rules that are automatically added to your rule list:

add action=accept chain=input comment="allow IKE" dst-port=500 protocol=udp
add action=accept chain=input comment="allow l2tp" dst-port=1701 protocol=udp
add action=accept chain=input comment="allow pptp" dst-port=1723 protocol=tcp
add action=accept chain=input comment="allow sstp" dst-port=443 protocol=tcp

I discovered this using /log print follow-only in the RouterOS CLI. It will likely be helpful in the future.

Additionally, there are two rules that allow IPSec in and out:

add action=accept chain=forward comment="defconf: accept in ipsec policy" ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" ipsec-policy=out,ipsec

So now we’re seeing the firewall rules configured appropriately. And we see better behavior from the client that is connecting. But the OS still can’t connect. Checking the packet capture, there is two-way communication.

Nothing egregious jumping out at me here, but this is also the first time I troubleshoot VPN connectivity at the configuration level. Let's dig in a little more.

Tell Me All Of Your Secrets

macOS is likely going to have better logging than Mikrotik. So let’s check the log file in macOS using:

tail /var/log/ppp.log

And what I see when I try to connect is:

Not verbose in nature, but it's enough to get a start. Seems like there's still something misconfigured on the Mikrotik router.

SCCRQ is the Start-Control-Connection-Request outlined in RFC2661. This is the initialization message for the tunnel, and is being sent by my MacBook. It’s not getting a reply. Fine. Let’s go investigating.

There was a lot of hmac(SHA1) in the logs of the Mikrotik. That’s a problem. I’m going to reset the config of the Mikrotik at this point, as I’ve made a lot of changes and not a lot of versioning. And we’ll start over.

Take 2

First up, enable logging for l2tp and ipsec on the Mikrotik:

/system logging
add topics=ipsec,!packet
add topics=l2tp
/log print follow

Then, Quick Set to enable VPN. This is what we get:

15:30:00 system,info,account user admin logged in from 192.168.88.254 via telnet 
15:30:12 system,info user admin password changed by admin 
15:31:15 system,info log rule added by admin 
15:31:17 system,info log rule added by admin 
15:33:06 system,info cloud settings changed by admin 
15:33:06 system,info ppp secret <vpn> added by admin 
15:33:06 system,info pool dhcp changed by admin 
15:33:06 system,info pool vpn added by admin 
15:33:06 system,info nat rule added by admin 
15:33:06 system,info filter rule added by admin 
15:33:06 system,info filter rule added by admin 
15:33:06 system,info filter rule added by admin 
15:33:06 system,info filter rule added by admin 
15:33:06 system,info filter rule added by admin 
15:33:06 system,info dhcp client changed by admin 
15:33:06 system,info static dns entry changed by admin 
15:33:06 system,info PPTP Server settings changed by admin 
15:33:06 system,info L2TP Server settings changed by admin 
15:33:06 system,info SSTP Server settings changed by admin 
15:33:06 system,info ppp profile <default-encryption> changed by admin 
15:33:07 ipsec,debug 0.0.0.0[500] used as isakmp port (fd=18) 
15:33:07 ipsec,debug 0.0.0.0[4500] used as isakmp port with NAT-T (fd=26) 
15:33:07 ipsec,debug ::[500] used as isakmp port (fd=27) 
15:33:07 ipsec,debug ::[4500] used as isakmp port (fd=28) 

So we’re seeing a few things happen:

  • 5 firewall rules have been added. These I already knew about.
  • “Cloud settings changed by admin” and I’ve been kicking around in this device and I’ve yet to come across cloud settings. So we’ll investigate that.
  • PPP secret “VPN”, yeah that’s normal.
  • the DHCP pool dhcp was changed
  • the DHCP pool vpn was created. This is to ensure that the VPN devices have an address in local address space (which is default).
  • NAT rule added by admin.
  • DHCP client changed by admin (I don’t know why, yet).
  • static DNS entry changed by admin
  • PPTP server settings changed by admin
  • L2TP server settings changed by admin
  • SSTP server settings changed by admin
  • PPP profile <default-encryption> changed by admin
  • 0.0.0.0[500] used as isakmp port (fd=18)
  • 0.0.0.0[4500] used as isakmp port with NAT-T (fd=26)
  • ::[500] used as isakmp port (fd=27)
  • ::[4500] used as isakmp port (fd=28)

Ok, so that’s a number of changes. Let’s see if we can cheese this a little bit. Let’s export the current config to a file.

export file=config-vpn-quickset-enabled.rcf

Then we’ll undo the quickset which in the logs gives us:

16:51:51 system,info PPTP Server settings changed by admin 
16:51:51 system,info L2TP Server settings changed by admin 
16:51:51 system,info SSTP Server settings changed by admin 
16:51:51 system,info dhcp client changed by admin 
16:51:51 system,info pool dhcp changed by admin 
16:51:51 system,info static dns entry changed by admin 
16:51:51 system,info nat rule changed by admin 

And that is… less things. But let’s export that one too. And then we’ll reset the whole thing and export the default config, because that’s what I was actually going for. Looks like the set and unset behavior is asymmetric which is… annoying. So let’s run down the additions/changes from default config to Quick Set VPN enabled (I only checked the checkbox, and these are the resulting changes to the config):

# VPN IP range 192.168.89.1/24
/ip pool
add name=vpn ranges=192.168.89.2-192.168.89.255

# this seems consistent with the tutorials. local address is the router gateway itself
/ppp profile
set *FFFFFFFE local-address=192.168.89.1 remote-address=vpn

# the ipsec-secret=secret is a literal, the value is "secret", this is the layer 2 tunnel secret
/interface l2tp-server server
set enabled=yes ipsec-secret=secret use-ipsec=yes

# point-to-point-tunneling server, hadn't seen this enabled for VPN in the guides, only l2tp
/interface pptp-server server
set enabled=yes

# secure socket tunneling protocol server, same as above. must be some  
# built in shenanigan from Mikrotik to use their cloud infra to tunnel
# PPP via 443
/interface sstp-server server
set default-profile=default-encryption enabled=yes

# this is the dynamic DNS thing--I don't want it and don't need it
/ip cloud
set ddns-enabled=yes

# here come the firewall rules
add action=accept chain=input comment="allow IPsec NAT" dst-port=4500 \
    protocol=udp
add action=accept chain=input comment="allow IKE" dst-port=500 protocol=udp
add action=accept chain=input comment="allow l2tp" dst-port=1701 protocol=udp
add action=accept chain=input comment="allow pptp" dst-port=1723 protocol=tcp
add action=accept chain=input comment="allow sstp" dst-port=443 protocol=tcp
# this is a NAT rule targeting the traffic coming from the VPN dhcp pool
add action=masquerade chain=srcnat comment="masq. vpn traffic" src-address=\
    192.168.89.0/24

# this is the ppp secret
/ppp secret
add name=vpn password=markdvpn

# and then this is the logging I added
/system logging
add topics=ipsec,!packet
add topics=l2tp

So if this is a “functional” configuration for some VPN service, it’s going to be pretty janky. macOS was complaining about hashing algorithms and the Mikrotik was wanting to use SHA-1 which is understandably bad.

Ok, with no further modifications we got a different error:

17:36:13 ipsec,debug ===== received 731 bytes from 10.168.168.169[500] to 10.168.168.69[500] 
17:36:13 ipsec no IKEv1 peer config for 10.168.168.169 

# ok, let's try IKEv2--this is the first time I see this.
17:37:47 ipsec,debug ===== received 556 bytes from 10.168.168.169[500] to 10.168.168.69[500] 
17:37:47 ipsec -> ike2 request, exchange: SA_INIT:0 10.168.168.169[500] 4bbcb89ebe31d536:0000000000000000 
17:37:47 ipsec no IKEv2 peer config for 10.168.168.169 

That’s a different error. Sometimes that’s progress. Chasing down these gremlins isn’t always easy, but I also think that maybe the autoconfigure stuff is hampering me in ways I don’t yet know. I’m going to take another run at it with a fresh config. In WinBox, I head to System -> Reset Configuration and I allow for the default config. It’s a very reasonable base to start from, where the router is forwarding packets functionally. Look for my next post. I’ll do a little more research in the interim, as I think I’m missing a few pieces of this puzzle.

Hi, this post was checked with vale which is a content-aware linter. It was checked using the Microsoft style as well as some rules that I made. A summary of those results is below. More details as to how this was put together check out this post. This post had: 12 errors, 115 warnings and 61 suggestions For details on the linting of this post
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 75:104   warning     Use first person (such as       Microsoft.FirstPerson    
                      'me') sparingly.                                         
 75:144   warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 75:160   suggestion  'VPN' has no definition.        Microsoft.Acronyms       
 75:205   warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'Let's'.                                                 
 77:4     suggestion  'Tell Me All Of Your Secrets'   Microsoft.Headings       
                      should use sentence-style                                
                      capitalization.                                          
 77:9     warning     Use first person (such as       Microsoft.FirstPerson    
                      'Me') sparingly.                                         
 77:12    warning     Consider using 'all' instead    Microsoft.Wordiness      
                      of 'All Of'.                                             
 79:64    warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'let's'.                                                 
 85:9     warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 85:20    warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 89:189   suggestion  'being sent' looks like         Microsoft.Passive        
                      passive voice.                                           
 89:203   warning     Use first person (such as       Microsoft.FirstPerson    
                      'my') sparingly.                                         
 89:247   warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'Let's'.                                                 
 91:78    warning     Use first person (such as       Microsoft.FirstPerson    
                      'I'm') sparingly.                                        
 91:202   warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 104:29   suggestion  'VPN' has no definition.        Microsoft.Acronyms       
 104:47   warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 133:4    warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 135:25   suggestion  'been added' looks like         Microsoft.Passive        
                      passive voice.                                           
 135:42   warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 136:128  warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 137:3    suggestion  'PPP' has no definition.        Microsoft.Acronyms       
 137:14   error       Punctuation should be inside    Microsoft.Quotes         
                      the quotes.                                              
 137:15   suggestion  'VPN' has no definition.        Microsoft.Acronyms       
 137:33   suggestion  Don't use language (such as     Microsoft.Accessibility  
                      'normal') that defines people                            
                      by their disability.                                     
 138:7    suggestion  'DHCP' has no definition.       Microsoft.Acronyms       
 138:24   suggestion  'was changed' looks like        Microsoft.Passive        
                      passive voice.                                           
 139:7    suggestion  'DHCP' has no definition.       Microsoft.Acronyms       
 139:23   suggestion  'was created' looks like        Microsoft.Passive        
                      passive voice.                                           
 139:47   suggestion  Verify your use of 'ensure'     Microsoft.Vocab          
                      with the A-Z word list.                                  
 139:63   suggestion  'VPN' has no definition.        Microsoft.Acronyms       
 139:83   suggestion  Consider using 'discuss'        Microsoft.ComplexWords   
                      instead of 'address'.                                    
 139:100  suggestion  Consider using 'discuss'        Microsoft.ComplexWords   
                      instead of 'address'.                                    
 140:3    suggestion  'NAT' has no definition.        Microsoft.Acronyms       
 141:3    suggestion  'DHCP' has no definition.       Microsoft.Acronyms       
 142:10   suggestion  'DNS' has no definition.        Microsoft.Acronyms       
 143:3    suggestion  'PPTP' has no definition.       Microsoft.Acronyms       
 145:3    suggestion  'SSTP' has no definition.       Microsoft.Acronyms       
 146:3    suggestion  'PPP' has no definition.        Microsoft.Acronyms       
 148:42   suggestion  'NAT' has no definition.        Microsoft.Acronyms       
 152:36   warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'Let's'.                                                 
 152:49   warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 152:82   warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'Let's'.                                                 
 158:6    warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 158:54   warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'us'.                           
 170:5    error       Use 'that's' instead of 'that   Microsoft.Contractions   
                      is'.                                                     
 170:12   warning     In general, don't use an        Microsoft.Ellipses       
                      ellipsis.                                                
 170:33   warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'let's'.                                                 
 170:69   warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 170:147  warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 170:234  warning     In general, don't use an        Microsoft.Ellipses       
                      ellipsis.                                                
 170:251  warning     Try to avoid using              Microsoft.We             
                      first-person plural like                                 
                      'let's'.                                                 
 170:321  suggestion  'VPN' has no definition.        Microsoft.Acronyms       
 220:53   suggestion  'VPN' has no definition.        Microsoft.Acronyms       
 220:180  suggestion  'SHA' has no definition.        Microsoft.Acronyms       
 222:35   warning     Try to avoid using              Microsoft.We             
                      first-person plural like 'we'.                           
 234:104  warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 234:166  warning     Use first person (such as       Microsoft.FirstPerson    
                      'me') sparingly.                                         
 234:176  warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 234:195  warning     Use first person (such as       Microsoft.FirstPerson    
                      'I'm') sparingly.                                        
 234:308  warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 234:311  suggestion  Verify your use of 'allow'      Microsoft.Vocab          
                      with the A-Z word list.                                  
 234:348  warning     Consider removing 'very'.       Microsoft.Adverbs        
 234:446  warning     Use first person (such as       Microsoft.FirstPerson    
                      'my') sparingly.                                         
 234:509  warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 234:518  warning     Use first person (such as       Microsoft.FirstPerson    
                      'I'm') sparingly.                                        
 236:40   suggestion  'was checked' looks like        Microsoft.Passive        
                      passive voice.                                           
 236:146  suggestion  'was checked' looks like        Microsoft.Passive        
                      passive voice.                                           
 236:184  suggestion  Verify your use of 'as well     Microsoft.Vocab          
                      as' with the A-Z word list.                              
 236:210  warning     Use first person (such as ' I   Microsoft.FirstPerson    
                      ') sparingly.                                            
 236:284  suggestion  'was put' looks like passive    Microsoft.Passive        
                      voice.                                                   

12 errors, 116 warnings and 65 suggestions in 1 file.