On Tue, Feb 1, 2011 at 2:39 PM, John Mahoney <jmahoney@xxxxxxxx> wrote: > On Tue, Feb 1, 2011 at 2:27 PM, Elvis Yoan Tamayo Mollares > <etmoyares@xxxxxxxxxx> wrote: >> hi list, during ip forwarding process, the kernel replace the source MAC >> address of the package it received with my own MAC address.. My question >> is: Is there any way to avoid this behavior? > > That is what routing does at the ip layer. You may be able to > accomplish this by bridging the two ports together so that the traffic > is handled at layer 2. As a side note, looking at the iptables target: -m mac --mac-source XX:XX:XX:XX:XX:XX [1] and the kernel code for that module (net/netfilter/xt_mac.c) it appears that the src MAC address is saved in the sk_buff and is still accessible in the PREROUTING, INPUT, and FORWARD chains via eth_hdr(skb)->h_source. I do not know if that helps. I guess my point is my first answer was the logical one, but it may be possible if you think outside the box. -- John [1]http://www.faqs.org/docs/iptables/matches.html#TABLE.MACMATCH _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
