OpenVPN and static IP for ALL clients

Pippin

Tunnel subnet size - 4 = nr. of clients
/24 - 4 = 252 clients
/25 - 4 = 124 clients
etc.

ThePieMonster

@Rico
I just tried this myself and was not able to get the client to have a static IP.

The server tunnel network is 10.1.200.0/24.
The client has its own cert.
That certs common name is entered in the Common Name field in the client override section.
Also the IPv4 Tunnel Network is 10.1.200.100/24 for the client override.

Client just ends up getting the next available address from DHCP still...

noplan

hi there
client specific override the way it works.

IPv4 Tunnel Network ip that client shall receive eg 1.2.3.4/24
in Advanced fill in: ifconfig-push 1.2.3.4 255.255.255.0;
Server List select a / the server

3)Common Name & Description must be exactly the same as used when u created the user
i personally do a copy n paste in user management for username full name and the cert for the user

~~4)restart openVPN server~~ EDIT: (not nescenecessary)

export your credentials .... done

what i learned that sometimes at the first connect of the client with client spec override
the assigned IP will not be assigned. DIsconnect the client, restart the openVPN service and it works, disconnecting and connecting after 5 minutes also works.

if there are any improvements, or things to do better feel free to comment

brNP

Rico

Restarting the OpenVPN server because of adding some CSO? That would be a massive pain and I never had to do that.
I also nerver had to fill Advanced / ifconfig-push...

-Rico

noplan

ok restartin is a true pain in the .. .
and it is workin without restarting. (true)

without Advanced / ifconfig-push... not workin here
to true for all devices on some it does on some it does not
with Advanced / ifconfig-push... workin like a charm and no problems

out of the blue any side effect / disadvantages cuz of usin ifconfig-push ?

brNP

vjfromgt

On my linux box, I have a script which creates client accounts and sets ips
can something like this be done?

ThePieMonster

@noplan said in OpenVPN and static IP for ALL clients:

ifconfig-push 1.2.3.4 255.255.255.0;

What is wrong with the below setup?
The domain username is not TEST (it is DOMAIN\USERNAME, actually I don't even enter the DOMAIN\ part when authenticating with the OpenVPN prompt), but that shouldn't matter correct? It's just based off the CN name?

alt text

noplan

i use this here (and remember i use exact copy n paste) in:

and still in User Management:
u have to klick Crate a user certificate

and in client spec overrides :

and it works ...
read my other comments in this post why i use Advanced / ifconfig-push...

(edit 10/04/20 more screenshots as requested)

brNp

ThePieMonster

@noplan said in OpenVPN and static IP for ALL clients:

i use this here (and remember i use exact copy n paste) in:

and in:

and in client spec overrides :

and it works ...
read my other comments in this post why i use Advanced / ifconfig-push...

brNp

Can you take larger screenshots to see more of the page? I'm not sure where this username field would be...

noplan

@ThePieMonster

done added more screenshots

ThePieMonster

@noplan said in OpenVPN and static IP for ALL clients:

@ThePieMonster

done added more screenshots

So my users are domain users. How would using the User Manager certificate work?

This link shows that using User Certificates is not part of the process.
https://fastinetserver.wordpress.com/2013/03/09/pfsense-openvpn-static-ip-for-clients/

Pictures for location reference

User Manager User Certificate

Certificate Manager Certificate

noplan

hey @ThePieMonster

dont get me wrong ...
add a user / click to add a user certificate
and follow the instructions here in that post. and test it if it works for you then go to the next step.
(all of the information you need is provided here)

as far as i m concerned the link --> klick you provided is a) from 2013 and b) mentions as u can see in the screenshot
that User Certificates is part of the process.

possibly the next step my be
check how to import the DOMAIN User Cert to pfS ore use the domainUserDB as Backend in pfS
and test the whole loop again, let me mention that it would be pretty sweet when you keep us all informed how it works / or even not. But this is not part of this topic i think, cuz static IP for VPN-clients is pretty much solved here.

br nP

viktor_g

If you need per-client firewall rules, a more efficient way is to use Cisco-AVPair RADIUS ACLs:
https://docs.netgate.com/pfsense/en/latest/book/openvpn/controlling-client-parameters-via-radius.html

noplan

@viktor_g

oh yeah i like that, but lack of useCase :(

i think @ThePieMonster needs a static IP for his vpn-clients
but a static Ip only helps when rules are set ;) so whats NEXT !

ThePieMonster

@noplan @viktor_g

As I mentioned the user cert is from the the Certificate Manager / Certificates section of pfSense, not from the User Manager section. There are two locations where a user certificate can be created.

I also found out today, that the common name, is not the CN name of the cert, that can be whatever you like, but the username of the domain user. Switching this info around in the client override solved the issue for me.

TLDR: CN = Domain Username, not Certificate name.

noplan

@ThePieMonster said in OpenVPN and static IP for ALL clients:

Switching this info around in the client override solved the issue for me.

so please mark this posting als SOLVED !

ThePieMonster

@noplan I would but I'm not OP. :)

stephenw10

There seems to be some mis-information in this thread.

You do not need to add the custom push line in a Client Specific Override. Adding the tunnel network as an IP address already does exactly that.

You often do need to restart the OpenVPN server to read in the CSOs: https://redmine.pfsense.org/issues/10337
That should probably be marked a feature though, nothing has changed there.

Steve

noplan

@stephenw10 said in OpenVPN and static IP for ALL clients:

You do not need to add the custom push line in a Client Specific Override

as i mentioned earlier
the reason why i added it and still doin it

there are clinets out there in the wild where the CSO is not working without
the custom push added.

thanks for pointin me to issue 10337

brNP
#staysafe

viktor_g

@ThePieMonster said in OpenVPN and static IP for ALL clients:

@noplan @viktor_g

I also found out today, that the common name, is not the CN name of the cert, that can be whatever you like, but the username of the domain user. Switching this info around in the client override solved the issue for me.

TLDR: CN = Domain Username, not Certificate name.

You can change this behavior on 2.5 branch,
or by applying patch https://redmine.pfsense.org/issues/8289 on 2.4.4/2.4.5