Messages in this thread | | | Subject | Re: TCP/IP Packet Loss (2.2.13pre17) | From | Andi Kleen <> | Date | 15 Oct 1999 22:13:42 +0200 |
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edgy@alliedtours.com (Benjamin Suto) writes: > > We've run tcpdump on that network segment and noticed a few things. > Most of the time, the connections are initiated and the mail checks go > through instantaneously. Sometimes, however it seems like the > connection is initiated, there is a delay of 6-7 seconds, then the linux > server makes an ARP request for the machine, the machine responds, and > things progress. We do not seem to have a network problem. > > Does anyone have any suggestions, or any other troubleshooting we can do > to make this problem easier to solve?
Get the iproute2 utility from ftp.inr.ac.ru:/ip-routing, and check the state of the neighbour entry on failure with "ip neigh".
Play with the timeout parameters of the ARP state machine ( /proc/sys/net/ipv4/core/<interface>/*) - especially base_reachable_time, delay_first_probe_time, gc_stale_time. The sysctls are documented in arp(7) in manpages-1.25+.
-Andi
-- This is like TV. I don't like TV.
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