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

It used to happen to me as well, but it was all fixed when i configured the
No-OP keeps in SecureCRT. Try it if it works GR8, if it does not, then move
on to the next issue.
On Sun, Jan 23, 2011 at 11:42 AM, Shane K <shanekgs_at_gmail.com> wrote:

> I have this same issue.
> After about an hour or two (it varies), my session just locks up and I have
> to reconnect.
>
> I don't believe this is a timeout issue.
>
>
>
> On Sun, Jan 23, 2011 at 7:13 PM, Narbik Kocharians <narbikk_at_gmail.com>wrote:
>
>> 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
>> > >>
>> > >>
>> > >>
>> _______________________________________________________________________
>> > >> Subscription information may be found at:
>> > >> http://www.groupstudy.com/list/CCIELab.html
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >> -- 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
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
>> > Subscription information may be found at:
>> > http://www.groupstudy.com/list/CCIELab.html
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>> --
>> *Narbik Kocharians
>> *CCSI#30832, CCIE# 12410 (R&S, SP, Security)
>> www.MicronicsTraining.com <http://www.micronicstraining.com/> <
>> http://www.micronicstraining.com/>
>>
>> Sr. Technical Instructor
>> *Ask about our FREE Lab Voucher with our Boot Camps*
>> YES! We take Cisco Learning Credits!
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>>
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>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
>

-- 
*Narbik Kocharians
*CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com <http://www.micronicstraining.com/>
Sr. Technical Instructor
*Ask about our FREE Lab Voucher with our Boot Camps*
YES! We take Cisco Learning Credits!
Training & Remote Racks available
Blogs and organic groups at http://www.ccie.net