topic Re: telnet in Operating System - Linux

telnet

Chakravarthi — Fri, 23 Sep 2005 02:30:08 GMT

hi,

i'm using very old 2.2 kernel machine,now
how do i findout how many telnet sessions are allowed and how many are there?

Re: telnet

Muthukumar_5 — Fri, 23 Sep 2005 02:58:31 GMT

You can count number of open telnet sessions as,

# netstat -na | grep -w '23'

hth.

Re: telnet

Muthukumar_5 — Fri, 23 Sep 2005 03:02:09 GMT

To get the telnet sessions are allowed,

refer this thread:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=73301

Basec on /etc/xinet.d/telnet file for instance information, session count is activated for telnet.

hth.

Re: telnet

Alessandro Pilati — Fri, 23 Sep 2005 03:11:55 GMT

How much telnet sessions are still present:
netstat -an|grep -i esta|grep ":23 "|wc -l

How much are allowed:
in the file /etc/xinetd.d/telnet,
check for "instances = X", where X is the number of sessions allowed for the service telnet.

Rgds,
Alex

Re: telnet

Chakravarthi — Fri, 23 Sep 2005 03:48:04 GMT

this is very old server, ther is no xinetd,
it uses inetd.conf

Re: telnet

Ivan Ferreira — Fri, 23 Sep 2005 04:51:29 GMT

The number of telnet sessions is normally limited by te number of pty/pts devices.

For example, in Tru64 Unix (old version), you must manually create the pty devices to allow more telnet connections, with MAKEDEV pty.

Now, I think that in Linux (Not sure for your kernel version), ptys are allocated dynamically.

See:

http://www.linux.com/howtos/Text-Terminal-HOWTO-6.shtml

http://www.atnf.csiro.au/people/rgooch/linux/docs/devfs.html

Now, for the number of current sessions, you can run:

netstat -an |grep ESTABLISHED|grep w.x.y.z:23 | wc -l

Re: telnet

Chakravarthi — Mon, 26 Sep 2005 01:37:48 GMT

hi,

i use 2.2.14 kernel ( redhat 6.2)

--chakri

Re: telnet

VEL_1 — Mon, 26 Sep 2005 03:10:29 GMT

Hi,

Just refer the following link. You can get the info:

http://groups.google.com/group/comp.os.linux.networking/browse_thread/thread/49e02bae57bd3667/2a3ed2543192651d?lnk=st&q=increase++telnet+session+Linux&rnum=2&hl=en#2a3ed2543192651d

Thanks.

Re: telnet

Chakravarthi — Thu, 29 Sep 2005 02:22:36 GMT

thanks for the responses