NAT corrupts mac addresses leading to packet loss -> Fixed in SVN

[egwspiti]

Attached are the output of "ping www.virtualbox.org" and "tcpdump icmp -s 0 -w icmp.log" both executed at the guest OS. ping shows a significant packet loss, while tcpdump shows that all the icmp replies were received. however, the dst mac address of the icmp replies was quite random thus leading to packet loss. the current logs are from an INTEL PRO/1000 MT Server (the same happens with the default PCnet-FAST III)

Host OS is winxp sp3, guest OS is linux. In bridged mode there're no corrupted mac addresses / packet loss.

[egwspiti]

tcpdump icmp -s 0 -w icmp.log

[egwspiti]

ping www.virtualbox.org

[vasily Levchenko]

Could you please attach ​pcap file?

[egwspiti]

icmp.log is the pcap file

[vasily Levchenko]

Replying to egwspiti:

icmp.log is the pcap file

Could you please point me on broken packet (frame number)? Please look at #4540, here you can find Windows specifics of ICMP handling.

[egwspiti]

Replying to Hachiman:

Replying to egwspiti:

icmp.log is the pcap file

Could you please point me on broken packet (frame number)? Please look at #4540, here you can find Windows specifics of ICMP handling.

frame 3 has ethernet II dst : 00:01:00:01:00:00,

frame 6 has ethernet II dst : cd:00:b4:d2:cd:00,

frame 8 has ethernet II dst : 23:4e:0a:00:08:09,

frame 10 has ethernet II dst : d3:5d:0a:00:08:09,

frame 12 has ethernet II dst : ba:6f:0a:00:08:09, and so on... the correct ethernet II dst is 08:00:27:04:af:cc (ie the ethernet II src of the packets originating from the guest OS)

[vasily Levchenko]

Replying to egwspiti:

Replying to Hachiman:

Replying to egwspiti:

icmp.log is the pcap file

Could you please point me on broken packet (frame number)? Please look at #4540, here you can find Windows specifics of ICMP handling.

frame 3 has ethernet II dst : 00:01:00:01:00:00,

frame 6 has ethernet II dst : cd:00:b4:d2:cd:00,

frame 8 has ethernet II dst : 23:4e:0a:00:08:09,

frame 10 has ethernet II dst : d3:5d:0a:00:08:09,

frame 12 has ethernet II dst : ba:6f:0a:00:08:09, and so on... the correct ethernet II dst is 08:00:27:04:af:cc (ie the ethernet II src of the packets originating from the guest OS)

yep, thanks.

[vasily Levchenko]

Replying to Hachiman:

Replying to egwspiti:

Could you please update your user info or drop me a message at [vasily _dot_ levchenko _at_ Sun _dot_ COM]? I will offer to you testbuild for verification.

[Peter Noble]

Return traffic should come back with MAC 08-00-27-CD-6E-A9 but does not.