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From: unauthorized@internode.on.net
To: netfilter@lists.netfilter.org
Subject: problem with hostB wifi0 -> aDSL modem wifi0 -> hostA wifi0 -> hostA eth0 -> hostA ppp0 -> aDSL modem bridge --- Not MASQUERADEing...
Date: Mon, 22 Jan 2007 23:32:32 +1100	[thread overview]
Message-ID: <20070122233232.6e63e55b@athlon1> (raw)

Hello,

	I am trying to figure out why my current MASQUERADEing is not working.  It may not even be related to netfilter, but that's why I'm asking.  I might just have missed something (can't think of anything though).  The setup is as follows:

There are 2 switches involved in this network.

Switch1 is a typical netgear 10/100 switch.
Switch2 is built into the wireless aDSL modem.
aDSL modem has 1 wireless interface (172.25.25.100).

hostA is running linux 2.6.17.
hostA has 1 ethernet interface (eth0) via Switch1 (192.168.0.9).
hostA has a psuedo interface for pppoe via eth0.
hostA has 1 wireless interface (ath0) via aDSL modem wifi0 (172.25.25.10).
hostA is the router for all networks.
hostA is the firewall for all network.

hostB is running linux 2.6.17.
hostB has 1 wireless interface (eth1) via aDSL modem wifi0 (172.25.25.99).

hostC is running linux 2.6.17.
hostC has 1 ethernet interface (eth0) via Switch1 (192.168.0.129).


Now to explain the problem.  All traffic from anywhere to anywhere is ACCEPTed (for testing purposes), all traffic out ppp0 is MASQUERADEd.
If I am coming from any 192.168.0.0/24 to anywhere MASQUERADING works just fine.
If I am coming from any 172.25.25.0/24 to 192.168.0.0/24 the connections work just fine.
If I am coming from any 172.25.25.0/24 to anything through ppp0 to anywhere !192.168.0.0/24,!172.25.25.0/24 (eg: external internet site) it does not MASQUERADE.

I can send my rules if need be.  I'll sanitize them with the above IP address layout to make it easier.  I'm not sure if attachments are allowed.  Anyway do I need to do something special (inside or outside) with netfilter / iptables in order to allow traffic from a wifi interface to an ethernet interface (bridge?)?  I can't even run on hostA:
ping -I ath0 <external internet site>
as that fails.

Thanks,

Chris-


             reply	other threads:[~2007-01-22 12:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-22 12:32 unauthorized [this message]
2007-01-22 12:48 ` problem with hostB wifi0 -> aDSL modem wifi0 -> hostA wifi0 -> hostA eth0 -> hostA ppp0 -> aDSL modem bridge --- Not MASQUERADEing unauthorized
2007-01-23 10:03   ` unauthorized

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