openssh 3.1p1: ToS trouble

[Oliver Wellnitz]

Hi,

I noticed that the Type of Service bit for minimize delay is set in
client->server packets only. Is this OS-specific or is there another
reason for this?

Here is a tcpdump of an interactive connection:

217.225.98.212.22 > 134.169.34.19.45870: P 1:49(48) ack 48 win 12008 (DF)
134.169.34.19.45870 > 217.225.98.212.22: P 48:96(48) ack 49 win 25416 (DF) [tos 0x10] 
217.225.98.212.22 > 134.169.34.19.45870: P 49:97(48) ack 96 win 12008 (DF)
134.169.34.19.45870 > 217.225.98.212.22: P 96:144(48) ack 49 win 25416 (DF) [tos 0x10] 
217.225.98.212.22 > 134.169.34.19.45870: P 97:145(48) ack 144 win 12008 (DF)
134.169.34.19.45870 > 217.225.98.212.22: . 144:144(0) ack 145 win 25416 (DF) [tos 0x10] 
134.169.34.19.45870 > 217.225.98.212.22: P 144:192(48) ack 145 win 25416 (DF) [tos 0x10] 
217.225.98.212.22 > 134.169.34.19.45870: P 145:193(48) ack 192 win 12008 (DF)
134.169.34.19.45870 > 217.225.98.212.22: P 192:240(48) ack 193 win 25416 (DF) [tos 0x10] 
217.225.98.212.22 > 134.169.34.19.45870: P 193:241(48) ack 240 win 12008 (DF)
134.169.34.19.45870 > 217.225.98.212.22: P 240:288(48) ack 241 win 25416 (DF) [tos 0x10] 

I'm using the ToS field for priority queuing, so this is a problem for me.

oliver at stargate:~ > uname -rs ; ssh -V
Linux 2.4.17-lvm
OpenSSH_3.1p1, SSH protocols 1.5/2.0, OpenSSL 0x0090602f


Oliver