Messages in this thread | | | Date | Thu, 4 Apr 1996 16:09:26 +0200 | From | Arnt Gulbrandsen <> | Subject | Re: Slow PPP/SLIP bug: Found change that caused problem |
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clameter@miriam.fuller.edu (Christoph Lameter) > Alan Cox (alan@cymru.net) wrote: > : > telnet connections using TCP/IP are slow, but if I use > : > ssh (secure telnet) all is fine. > : > > : > ssh has its own packet handling and bypasses TCP. > > : No > > Yes. SSH uses TCP socket number 20 to establish the connection but then > switches to something they call the "binary protocol" to do the > actual transmissions in a secure way.
No. SSH uses TCP port number 22, first to authenticate the user, negotiate encryption and s on, then as a transport for the "packet based binary protocol" you talk about.
FYI, most modern TCP-based protocols I've seen use more or less the same technique, line-based protocols like SMTP are a little old hat.
And port 20 is used for FTP data connections.
--Arnt
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