newbie: rh6.2 telnet performance...
pbarker at barker.dropbear.id.au
Mon Aug 20 14:23:37 EST 2001
On Mon, 20 Aug 2001, Jerry Cashman wrote:
> I'm very new to this linux thing, and am trying to learn meself some RedHat.
> (yee haaa)
> The network is pretty damn simple... a straight (twisted) cable connects the
> linux box and laptop! No hubs, routers, etc etc etc...
I assume you're talking about a "crossover" cable here - or one of your
machine auto-detects a null-link.
> inetd is running as is telnetd and ifconfig tells me that eth0 is UP and
Ob. security. Make sure your telnetd is either up-to-date or disabled on
any external interface. I have a suspicion there may be a serious problem
with the current telnetd bug at some stage.
> Here's the problem... when I try to telnet to the linux box from my laptop,
> I get a very extended (like, several minutes) delay before it replies with a
> login prompt!
> When I start my telnet client is connects straight away, I'm pretty sure the
> linux box knows that there is someone at the door, 'cause it's ancient old
> hard-disk rattles nicely for a second or two as soon as I try to connect...
This smells like a DNS issue. When trying to log the connection from the
"other box", telnetd is blocking waiting for a response to a name-server
To verify this, you could try using strace.
If this is the problem, dropping an entry in /etc/hosts should fix it.
> Jerry Cashman
Peter Barker | N _--_|\ /---- Barham, Vic
Programmer,Sysadmin,Geek | W + E / /\
pbarker at barker.dropbear.id.au | S \_,--?_*<-- Canberra
You need a bigger hammer. | v [35S, 149E]
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