[OpenAFS] OpenAFS, Cisco VPN and MAC OS and mtu
Douglas E. Engert
Fri, 15 May 2009 15:37:34 -0500
We are having problems with Mac OS 10.4 and 10.5 using Cisco VPN
AFS can become unusable. Mac 10.4 is running OpenAFS 1.4.8 for sure.
I think the Mac 10.5 is running OpenAFS 1.5.59.
Using rxdebug and looking at the natMTU parameter, on most Unix systems
this is 1444,(1500 - 56) as expected. On Windows systems this is usually
1260. And on MAC it is 1444.
Even if I set the interface mtu 1244, and reboot the MAC, rxdebug shows
the interface is using 1244 but rxdebug continues to show a natMTU = 1444.
as though it still assumed the mtu was 1500.
So it looks like the MAC client is not getting the existingMTU
from the OS in util/netutils.c
The AFS client on Windows has the RxMaxMTU (1244 appears to be the best
setting). Is there any equivelent option for the MAC?
Any thoughts on this?
Douglas E. Engert <DEEngert@anl.gov>
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439