No sure what you use, but this works for me in 2.6.24.3:
emnote linux-2.6-stable # tunctl -t tap0
Set 'tap0' persistent and owned by uid 0
emnote linux-2.6-stable # ifconfig tap0 mtu 2000
emnote linux-2.6-stable # ifconfig tap0
tap0 Link encap:Ethernet HWaddr 00:FF:8D:16:53:9A
BROADCAST MULTICAST MTU:2000 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
regards,
Jiri Olsa
Edward Chapman wrote:
> tap devices appear not to support an mtu higher than 1500:
>
> usilap:/ # uname -r
> 2.6.23.12
> usilap:/ # /usr/bin/tunctl -u root -t tap0
> Set 'tap0' persistent and owned by uid 0
> usilap:/ # ip link set tap0 mtu 1500
> usilap:/ # ip link set tap0 mtu 1501
> SIOCSIFMTU: Invalid argument
> usilap:/ # ip link set tap0 mtu 1600
> SIOCSIFMTU: Invalid argument
>
> Would it be trivial to remove this limitation? Can anyone tell me where
> is the code that is enforcing this limitation? Is it in
> drivers/net/tun.c ?
>
> thanks,
> Eddie
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-net" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-net" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
