Re: [LARTC] ssh versus scp

["M.F. PSIkappa" <psi@talker.sk>]

Hello,
It's nice but ...
When I make ssh connection, it has tos 0x10. It's Ok.
When I use ssh with any commands, than tos is 0x8. (e.i ssh user@host su)
And little trick to end...
When I make ssh tunnel, it has tos 0x10 and so I can push data with
minimum delay tos.

I think that there is only possibility to use bytecount patch.

On Mon, 25 Nov 2002, Martin A. Brown wrote:

> For posterity:
>
> Data gathered with the following tcpdump command:
>
> # tcpdump  -nnqti eth0 port 22 and host y.y.y.y
>
> ssh session:
> <session setup snipped, no special ToS value; normal>
>
> x.x.x.x.48101 > y.y.y.y.22: tcp 48 (DF) [tos 0x10]
> y.y.y.y.22 > x.x.x.x.48101: tcp 0 (DF)
> y.y.y.y.22 > x.x.x.x.48101: tcp 48 (DF) [tos 0x10]
> y.y.y.y.22 > x.x.x.x.48101: tcp 80 (DF) [tos 0x10]
> x.x.x.x.48101 > y.y.y.y.22: tcp 0 (DF) [tos 0x10]
>
> scp session:
> <session setup snipped, no special ToS value; normal>
>
> y.y.y.y.22 > x.x.x.x.48103: tcp 48 (DF)
> x.x.x.x.48103 > y.y.y.y.22: tcp 64 (DF) [tos 0x8]
> y.y.y.y.22 > x.x.x.x.48103: tcp 48 (DF) [tos 0x8]
> x.x.x.x.48103 > y.y.y.y.22: tcp 0 (DF) [tos 0x8]
> y.y.y.y.22 > x.x.x.x.48103: tcp 48 (DF) [tos 0x8]
>
> So, one *should* be able to do something like this:
>
> # iptables -t filter -A FORWARD -m tos --tos 0x08 -j scpchain
> # iptables -t filter -A FORWARD -m tos --tos 0x10 -j sshchain
>
> http://iptables-tutorial.frozentux.net/iptables-tutorial.html
>
> I haven't done it.....Good luck,
>
> -Martin

--
`)_|_('       PSIkappa
   I k        psi _at_ talker.sk

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