Re: [LARTC] ssh versus scp

[Ramin Alidousti <ramin@cannon.eng.us.uu.net>]

Hi,

You are out of luck here. There is no distinction between ssh and scp
at IP, TCP or the application layer for that matter. Basically scp is
a wrapper which uses ssh as the transfer method...

Ramin

On Mon, Nov 25, 2002 at 08:12:07PM +0100, Sebastian 'spax' Pape wrote:

> hi!
> 
> I'd like to priorize ssh traffic, but of course I don't like scp to
> get priorized, too. In the "actual script" of the howto priorization
> is done with this:
> 
> | # TOS Minimum Delay (ssh, NOT scp) in 1:10:
> | tc filter add dev $DEV parent 1:0 protocol ip prio 10 u32 \
> |      match ip tos 0x10 0xff  flowid 1:10
> 
> I'm not sure if I got all of it, but it seems to me, that there is no
> port match - it seems to me that this rule matches all packets with a
> Minimize-Delay 16 (0x10) TOS value.
> 
> I watched some packets with tcpdump and it also seems that scp packets
> all have the Maximize-Throughput 8 (0x08) TOS value, but all "pure
> ssh" packets have Normal-Service 0 (0x00). It's no problem to match
> these packets with iptables (just drop me a note if you want to have
> the iptables syntax). But the question I have is:
> 
> Are these TOS-values standard for ssh and scp or do all
> ssh/scp-clients use the values they like? I searched the net, but
> haven't found anything usefull, yet.
> 
> best regards
> 
> 		Sebastian
> 
> -- 
> Sebastian 'spax' Pape          | A diplomat is someone who can tell you to go
> mailto: sebastian@p-a-p-e.de   | to hell in such a way that you will look
> gpg: http://p-a-p-e.de/gpg.asc | forward to the trip.
>          --- Do you want to know more? http://www.p-a-p-e.de/ ---
> 
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