Packet loss when IP precedence bit set by upstream Cisco
Whipp at sou.edu
Thu Dec 30 17:44:57 CET 2004
Upstream ISP uses IP precedence bit to classify and rate limit Internet
traffic. We see a 10 - 20% packet loss at our linux firewall when
traffic is high (6-8Mbps traffic with precedence bit set). Testing with
iperf, traffic is not dropped when IP precedence is not set. No TOS or
tc/qdisc has been configured (latest 2.4 kernel and 1.2.11 netfilter).
iptables -A PREROUTING -t mangle -j TOS --set-tos Normal-Service
Still had packet loss.
Has anyone seen this? Suggestions for fix?
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