Mark Fedor (fedor@devvax.TN.CORNELL.EDU)
Mon, 21 Sep 87 16:32:08 -0400
Hi people. Recently here at cornell we have been
experiencing a number of strange routing problems.
Routes on certain vaxen gateways were being mysteriously
timed out, while other dedicated gateway boxes seemed
fine. Here at Cornell, we use RIP and everything is
dynamic. We have Proteon P4200's and vaxen running
gated/routed for gateways.
Our ARPAnet gateway, CU-ARPA was one of the victims of this
problem. CU-ARPA is a vax750 with 2 DEUNA's and one Pronet-10
interface. CU-ARPA also has an ARPAnet interface.
After pulling my hair out and checking the routing software, I
noticed that our vax was experiencing RIP congestion and couldn't
keep up with all the RIPpers on its networks.
On its Pronet 10 interface we have approx 11 RIPpers.
On 1 of its Ethernet interfaces we have approx 7 RIPpers.
on the other Ethernet interface we have 2 RIPpers.
Plus, since we have a large number of networks being RIPped
around, each gateway sends out 3 RIP packets for a complete update.
The routing process opens one socket and listens on the
RIP port. If I read the UDP code right, each socket
allocates space for 4k of datagrams. CU-ARPA is
easily dropping RIP packets left and right.
Has anyone else experienced this? Any suggestions? I suppose
I could increase "udp_recvspace" in netinet/udp_usrreq.c,
but that would only prolong the agony. I know, I know,
get a real machine for a gateway..... :^)
P.S. Not suprisingly, the Proteon P4200 is having no problems.
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