netdev - sky2, vlan and nat/masquerading

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Date:	Wed, 9 Mar 2011 18:15:22 +0100
From:	Christian Hesse <mail@...rm.de>
To:	netdev@...r.kernel.org
Subject: sky2, vlan and nat/masquerading

Hello everybody,

I have a Samsung NF310, running kernel 2.6.37.3 with a patch to make my
ethernet controller work for vlans. It was discussed with the subject "sky2:
convert to new VLAN model (v0.2)" and made it to to kernel tree with commit
86aa77854f47ab6f5f9c687507af1f57d2b89004.
However it does not work properly, here are the details:

* Switch with one trunk port and several port in corresponding vlan ports
* Host connected to one of the vlan ports
* Samsung Netbook (see above) connected to the trunk port.

I get an IP address 192.168.x.x/24 via DHCP on interface connected to vlan 1.
The interface connected to vlan 2 has 172.16.0.1/24 and serves addresses via
DHCP. The system is set up to masquerade from 172.16.0.1/24.

I can access my netbook from the host in vlan 2, however I can not access
anything behind. The packets contain a broken vlan tag and the host does not
recognize them.
I've attached a tcpdump log. Please take a look at the icmp echo request and
reply packets, especially the last one.

I've tested with an usb-ethernet-adapter and everything works fine, so my
setup is ok.
-- 
Regards,
Chris
Download attachment "tcpdump.log" of type "application/octet-stream" (688 bytes)