Lewis Adam-CAL022 wrote:
Hi all,
I tried going to the bridge@xxxxxxxxxxxxxx for this question but got no
response, I'm hoping somebody here has had a similar experience as me.
Basically, I put my wlan0 driver in a bridge with eth0. When my hard_start_xmit() function is called (as a result of a packet received on eth0 and bridged to my driver), the skb that I am passed contains an extra four bytes (e.g. the Ethernet FCS).
In my mind, this should be stripped off. But I have looked at all the open
source net drivers I could find and nobody seems to care. Is there a way to
know if the skb has been forwarded by a bridged interface? If I forward on the
extra bytes, then a 1500 byte packet becomes 1504 and fails the MTU check on
the other side of the wireless interface (when it is passed back to eth0).
TIA,
Adam
I added some ioctls to allow one to turn on the ability to receive the CRC,
but I
don't know of any drivers that include it by default.
What driver/hardware is your eth0 device?
How are you determining the size, by the skb->len ?
Does tcpdump/ethereal show the extra 4 bytes if you sniff eth0 w/out bridging?
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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