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

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>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.
>>
>>
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> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Mon Jan 24 2011 - 00:19:02 ART