[72861] in North American Network Operators' Group
RE: Loss of Telnet Capability to 6509
daemon@ATHENA.MIT.EDU (Jason Frisvold)
Wed Jul 28 15:37:27 2004
Date: Wed, 28 Jul 2004 15:33:45 -0400
From: "Jason Frisvold" <friz@corp.ptd.net>
To: "Richard J. Sears" <rsears@adnc.com>, "Nanog" <nanog@nanog.org>
Errors-To: owner-nanog-outgoing@merit.edu
Do you have ACL's restricting access to the vty's? I've seen instances =
where telnet ports get locked up because of port scanning and/or =
attacks...
--
Jason Frisvold
Penteledata
> -----Original Message-----
> From: Richard J. Sears [mailto:rsears@adnc.com]=20
> Sent: Wednesday, July 28, 2004 2:54 PM
> To: Nanog
> Subject: Loss of Telnet Capability to 6509
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> We posted this to cisco-nsp but someone suggested posting it here as
> well...
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> We have a 6509 running a SUP720 in IOS only mode (no cat os).=20
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> At around 4am this morning, we lost our ability to telnet to=20
> the router.
> Running a tcpdump shows that the router never responds to the telnet
> request.=20
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> All functions and interfaces on the router seem fine (bgp,=20
> etherchannel,
> ibgp, vtp, hsrp) and I can console into the sup with no=20
> problems at all,
> we just cannot telnet into it. The CPU is at around 6%.
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> I have checked all access lists on the router, none were added/removed
> or modified on line vty that would cause this problem. All logging
> appears normal.
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> We are running Version 12.2(17a)SX3.
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> Anyone have a similar problem or know how to check or restart=20
> the telnet
> process on the router without a reload...?
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> ******************************************
> Richard J. Sears
> Vice President =20
> American Digital Network =20
> ----------------------------------------------------
> rsears@adnc.com
> http://www.adnc.com
> ----------------------------------------------------
> 858.576.4272 - Phone
> 858.427.2401 - Fax
> INOC-DBA - 6130
> ----------------------------------------------------
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> I fly because it releases my mind=20
> from the tyranny of petty things . .=20
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> "Work like you don't need the money, love like you've
> never been hurt and dance like you do when nobody's
> watching."
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