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joeblack6
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Posts: 1
Joined: Sat May 21, 2022 4:14 am

IPSec S2S conflict

Sat May 21, 2022 6:15 am

Hi everyone,

First of all, sorry for my bad english.
I'm having trouble trying to configure a connection through an IPSec tunnel:
SITE 1 - Mikrotik
Private IP: 192.168.3.0/24
Public IP: 51.70.x.x

SITE 2 - Cisco
Private IP: 10.0.0.0/8
Public IP: 207.11.x.x

The problem is that site 2 already has a subnet 192.168.3.0/24 in its network, so we did the tunnel using the subnet 192.168.4.0/24 for the Local IP of Site 1. And then the NAT rules for Site 1:
dstnat - src=10.0.0.0/8 dst=192.168.4.0/24 action=netmap to 192.168.3.0/24
srcnat - src=192.168.3.0/24 dst=10.0.0.0/8 action=netmap to 192.168.4.0/24

Is that config valid? are we missing something?
 
Sob
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Posts: 9119
Joined: Mon Apr 20, 2009 9:11 pm

Re: IPSec S2S conflict

Sat May 21, 2022 8:24 pm

Yes, that should work. If it doesn't, then share some more info (config, error messages, description of what exactly happens, ...).

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