Editing Bridge doesn't forward packets
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− | Sometimes | + | Sometimes bridge can mysteriously drop the packets and not forward them. |
e.g. eyck user experienced a problem when some of the broadcasts were not | e.g. eyck user experienced a problem when some of the broadcasts were not | ||
delivered to container via the bridge. | delivered to container via the bridge. | ||
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BOOTP/DHCP, Reply, length 300 | BOOTP/DHCP, Reply, length 300 | ||
− | However, eth0 inside | + | However, eth0 inside container receives only 2nd packet with BOOTP/DHCP reply and doesn't see the 1st one with the request itself: |
15:21:52.291145 00:08:02:ac:36:20 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 172.17.8.254.67 > 255.255.255.255.68: | 15:21:52.291145 00:08:02:ac:36:20 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 172.17.8.254.67 > 255.255.255.255.68: | ||
BOOTP/DHCP, Reply, length 300 | BOOTP/DHCP, Reply, length 300 | ||
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== Resolution == | == Resolution == | ||
− | It is not obvious at all, but bridges (though | + | It is not obvious at all, but bridges (though have own ebtables filters) do also call iptables FORWARD chain when forwarding packets between interfaces. |
Thus your FORWARD iptables rules should allow all the packets which are supposed to go through. | Thus your FORWARD iptables rules should allow all the packets which are supposed to go through. | ||
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iptables -A FORWARD -d 255.255.255.255 -j ACCEPT | iptables -A FORWARD -d 255.255.255.255 -j ACCEPT | ||
to fix the issue. | to fix the issue. | ||
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== Credits == | == Credits == |