Can't ping through default gateway

Posted by Andrew G.H. on Super User See other posts from Super User or by Andrew G.H.
Published on 2013-10-27T20:49:24Z Indexed on 2013/10/27 21:56 UTC
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Filed under:

linux

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networking

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routing

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iptables

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raspberry-pi

I have the following configuration:

network-configuration

Routing table on M3 is:

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.2.1     0.0.0.0         UG        0 0          0 eth1
192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0 eth1
192.168.3.0     0.0.0.0         255.255.255.192 U         0 0          0 eth0

Routing table on M1 is:

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0 eth1

So basically M3's gateway is M1, and M1's gateway is M2's wireless internet interface. If I ping 8.8.8.8 from M1, everything is ok, replies are received. Pinging from M1 to M3 and viceversa is also possible.

I have configured M1 as gateway trafic forwarder using firestarter package and stopped firewall with it.

iptables policies are ACCEPT for everything.

Problem: I have tried ping-ing ip 8.8.8.8 from M3 but without success.

What could be the source of this problem?

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