26 Sep
2013
26 Sep
'13
1:12 a.m.
On 26 September 2013 10:54, Keith Owens <kaos@ocs.com.au> wrote:
On 26/09/13 10:48, Toby Corkindale wrote:
However for some reason path MTU discovery has completely broken when using the newer modem. The primary Linux box is fine, but all clients (whether wired, wireless *or even virtual*) fail to work unless I manually set their interfaces to an mtu of 1492.
Wild guess - TCP/UDP offload is generating bigger segments because the new modem accepts offload. On the interface that connects the server to the modem, issue
ethtool -K <interface> tso off ethtool -K <interface> uso off ethtool -K <interface> gso off
Interesting theory. Tested, no change though.