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 From:  Vincent Fleuranceau <vincent at bikost dot com>
 To:  Elvar <elvar at ooz dot net>, m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] cannot ping across tunnel
 Date:  Wed, 16 Feb 2005 09:04:13 +0100
> Hello,
> 
> I have recently set up an ipsec tunnel between two monowall installations.
> One side is 192.168.1.0/24 and the other is 192.168.2.0/24. The tunnel
> appears to be up without any errors. However, I CANNOT ping across the
> tunnel for some reason. Can anyone assist me with this issue?

Things to check:

1. Can you ping the remote m0n0wall LAN interface from the local 
m0n0wall WebGUI?

2. Is m0n0wall the default gateway for each LAN?

3. Are you sure you've used a /24 netmask (as mentioned above)?

Could you provide (anonymized) IPsec logs?

-- Vincent