Re: OT: Telenet to terminal server dropping -ubuntu 10 driving

Is your session dropping after some inactivity time? Or is it
dropping/hanging while you are working on it.

On Sun, Jan 23, 2011 at 5:59 AM, Radioactive Frog <pbhatkoti_at_gmail.com>wrote:

> yes, same issue with Cisco IPS :) its linux and i have another linux VM,
> same issue :(
>
> I have plugged in the wired connection so far so good...
>
> On Mon, Jan 24, 2011 at 12:43 AM, Carlos G Mendioroz <tron_at_huapi.net.ar
> >wrote:
>
> > If the problem follows the "originating" port, then your laptop
> > is triggering the issue, but not necessarily being the culprit :)
> >
> > If the other router is the same brand, then it could have the same
> > issue. That was why I was asking for another telnet server (i.e. not
> > a (cisco ?) router/switch.
> >
> > -Carlos
> >
> > Radioactive Frog @ 23/01/2011 10:19 -0300 dixit:
> >
> >> Thanks carlos,
> >> yes I do have another router and when i telnet to that router from my
> >> laptop it doesn't work either.
> >>
> >> however, http to the same terminal server works! just telnet would hung
> >> just like that.
> >>
> >> I have another laptop#2. telnet from laptop#2 works fine for both TS and
> >> Router#2.
> >> it's the just my this laptop#1 having issue with WIFI.
> >>
> >> I guess, I may try with wired LAN connection for a few hours and then
> see
> >> if it works.
> >> If it works via wired interface then it's just the WLAN chipset & driver
> >> issue.
> >> It will narrow down the issue :). will do it tomorrow and will update
> >> everyone
> >>
> >> FROG
> >>
> >>
> >> On Sun, Jan 23, 2011 at 10:34 PM, Carlos G Mendioroz <tron_at_huapi.net.ar
> <mailto:
> >> tron_at_huapi.net.ar>> wrote:
> >>
> >> Weird. I've seen, a long time ago, some crappy server that would
> >> hang when the connected port was over 32k. Reason was that it was
> >> being treated as a signed short and would not like negative
> >> port numbers.
> >>
> >> That may be consistent with this happening after a while of working.
> >> OS may start with low port numbers and start climbing.
> >>
> >> On the other hand, I would try to single the culprit. Do you have
> >> some ohter telnet server to try ?
> >>
> >> -Carlos
> >>
> >> Radioactive Frog @ 22/01/2011 22:08 -0300 dixit:
> >>
> >> Has anyone seen this telnet issue?
> >> I am connected to my 2511 terminal server using telnet from my
> >> laptop. It
> >> will work for something 2 or 3 hours (not timed) perfectly.
> >> then all of sudden ping from my laptop to Terminal server still
> >> works but
> >> all my telnet windows hung , see below .
> >>
> >>
> >> DSL/WIFI-RTR------wifi----LAPTOP
> >> |
> >> |-----10/100 LANwire--------Terminal Server---to lab gears
> >>
> >> both laptop and terminal servers are in the same subnet no
> >> firewall in
> >> between etc. other PC from my WLAN can telnet okay, its just the
> >> my laptop.
> >>
> >> Radioactive_at_frog ~/Desktop $ telnet 50.1.3.2
> >> Trying 50.1.3.2...
> >> Connected to 50.1.3.2.
> >> Escape character is '^]'.
> >>
> >>
> >> At the same time I have another router which I telnet from my
> >> laptop shows
> >> the same issue "escape character blah" and nothing happens after
> >> that. I
> >> dont get to put user/pass.
> >>
> >> So it's just not the terminal server.
> >>
> >> Tried a little bit digging on it and the fix was "enable" disable
> >> my
> >> wireless connection. i.e. on my IBM R61p press Fn key + F5.
> >> I can telnet after that and access lab normally.
> >>
> >> resetting TCP stack --> /etc/init.d/networking restart didn't
> >> fix it.
> >>
> >> No firewall configured on this. So I was wondering
> >>
> >>
> >>
> >> frog Desktop # tcpdump -ni wlan0 | grep 50.1.3
> >> tcpdump: verbose output suppressed, use -v or -vv for full
> >> protocol decode
> >> listening on wlan0, link-type EN10MB (Ethernet), capture size
> >> 65535 bytes
> >>
> >> 12:00:54.313282 IP 50.1.3.15.53851 > 50.1.3.2.23: Flags [P.], seq
> >> 2208563960:2208563987, ack 1599023550, win 5840, length 27
> >> 12:00:55.982996 IP 50.1.3.15.60803 > 50.1.3.2.23: Flags [S], seq
> >> 382968090,
> >> win 5840, options [mss 1460,sackOK,TS val 4156193 ecr
> >> 0,nop,wscale 6],
> >> length 0
> >> 12:00:56.004516 IP 50.1.3.2.23 > 50.1.3.15.60803: Flags [S.], seq
> >> 3537695090, ack 382968091, win 4128, options [mss 1460], length 0
> >> 12:00:56.004551 IP 50.1.3.15.60803 > 50.1.3.2.23: Flags [.], ack
> >> 1, win
> >> 5840, length 0
> >> 12:00:56.004675 IP 50.1.3.15.60803 > 50.1.3.2.23: Flags [P.],
> >> seq 1:28, ack
> >> 1, win 5840, length 27
> >> 12:00:56.213642 IP 50.1.3.2.23 > 50.1.3.15.60803: Flags [.], ack
> >> 28, win
> >> 4101, length 0
> >>
> >> .15 = my laptop IP
> >> .2 = Terminal srv IP
> >>
> >> see above tcpdump , laptop (.15) keep sending ack but never get
> >> syn.
> >>
> >> It's just my lapotp that is playing up. SSH works but not the
> >> telnet.
> >>
> >>
> >> Anyone have seen above?
> >> I have upgraded kernel to the latest but still seeing this
> >> happening. I can
> >> access everything else but not the telnet.
> >> i can access the internet etc okay on my laptop. ssh to other
> >> switch in the
> >> same subnet is okay. changed the cable.
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >>
> >> _______________________________________________________________________
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> -- Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:
> tron_at_huapi.ba.ar
> >> >>
> >> LW7 EQI Argentina
> >>
> >>
> >>
> > --
> > Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
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