Tos in IP header
hello,
i'm looking for a method to evaluate the gain in performance
involved by the sets of TOS bits.
I'm using ferm to build my firewall the rules are :
chain output policy ACCEPT {
proto tcp if $WAN_IF goto tosqueue
}
chain tosqueue
{
# reverse rules to match any connection
protocol tcp reverse ACCEPT
{
# set tos bits according to traffic type
dport (ssh,ftp) settos min-delay;
dport (smtp,pop3,domain,8080) settos max-reliability;
dport (ftp-data) settos max-throughput;
}
}
I've some extra question :
- this exemple is from the official ferm's homepage, the author prevent from
using ToS for UDP, can someone explain me why ?
- why it is recommand to set only one bit ? (from ipchains man)
thank you, sorry for my poor english i'm french student
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