[THIN] Re: Port Scanning

:-)

> -----Original Message-----
> From: Ryan Lambert [mailto:rlambert@xxxxxxxxxxxxxxx]
> Sent: Monday, March 29, 2004 3:32 PM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Port Scanning
> 
> 
> Ya, I know.... ;-)
> 
> -----Original Message-----
> From: Henry Sieff [mailto:hsieff@xxxxxxxxxxxx]=20
> Sent: Monday, March 29, 2004 4:30 PM
> To: 'thin@xxxxxxxxxxxxx'
> Subject: [THIN] Re: Port Scanning
> 
> If its the same issue I am thinking of, its not actually a caveat, but
> does
> require tuning of the small memory buffers. FWIW, there are 
> also chances
> that portscanners can have an effect on cisco equipment; there was a
> great
> one where if you did the sU scan and inclused port 514, a 2600 running
> 12.0(2) would simply reload.
> 
> In almost all cases that I am familiar with, the issue arises not when
> hosts
> are scanned through a router/layer3 switch, but when the device itself
> is
> scanned. Usually, there are specific actions which can be taken to
> mitigate.
> 
> Henry
> 
> > -----Original Message-----
> > From: Timothy Mangan [mailto:tmangan@xxxxxxxxxxxx]
> > Sent: Monday, March 29, 2004 3:09 PM
> > To: thin@xxxxxxxxxxxxx
> > Subject: [THIN] Re: Port Scanning
> >=20
> >=20
> > They really should fix that - it has been a problem for many=20
> > years now.
> > It's really a packet rate thing.  You can pound it with any=20
> > small packets to
> > hose up the router.  I've seen it done with both bisync and=20
> > icmp traffic.
> >=20
> > tim
> >=20
> > -----Original Message-----
> > From: thin-bounce@xxxxxxxxxxxxx=20
> > [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
> > Of Ryan Lambert
> > Sent: Monday, March 29, 2004 3:13 PM
> > To: thin@xxxxxxxxxxxxx
> > Subject: [THIN] Re: Port Scanning
> >=20
> > Hi James,
> >=20
> > UDP scanning with nmap (-sU) has been known to crash Cisco 
> IOS version
> > 12.0T, 12.0S, etc.
> >=20
> > -----Original Message-----
> > From: James A. Hayes [mailto:jhayes@xxxxxxxxxxxxxxxxxx]=3D20
> > Sent: Monday, March 29, 2004 2:10 PM
> > To: thin@xxxxxxxxxxxxx
> > Subject: [THIN] Port Scanning
> >=20
> > Has anyone seen where port scanning caused major network 
> issues?  Our
> > security officer runs port scans on our network when ever 
> she wants to
> > and
> > it never fails that our network then chugs down to a 
> complete halt and
> > we
> > have to reboot our core switch to correct the problem.  Any ideas or
> > suggestions?
> > =3D20
> >=20
> > James A. Hayes
> >=20
> > Network Operations Manager & Assistant Vice-President
> >=20
> > The Peoples Bank & Trust Company
> >=20
> > =3D20
> >=20
> > (work) 662.680.1667
> >=20
> > (mobile) 662.401.0750
> >=20
> > (fax) 662.680.1502
> >=20
> > =3D20
> >=20
> > =3D20
> >=20
> >=20
> >=20
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> consulting integration firm in the nation. Emergent OnLine 
> delivers expert 
> consulting services you can depend on.
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firm in the nation. Emergent OnLine delivers expert 
consulting services you can depend on.
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