Hello, Patrick McHardy a écrit :
The bridge netfilter code calls the IP POST_ROUTING hook for outgoing packets, but the packet already went through it during forwarding.
Indeed I noticed once that a forwarded (i.e. not bridged) IP packet goes through the iptables POSTROUTING chain twice (after iptables FORWARD and after ebtables POSTROUTING) when the input and output interfaces are both bridges. But only once (after iptables FORWARD) when only the output interface is a bridge. Puzzles me why.
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