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RE: [nv-l] Authentication failure traps from Windows clients

To: "'nv-l@lists.us.ibm.com'" <nv-l@lists.us.ibm.com>
Subject: RE: [nv-l] Authentication failure traps from Windows clients
From: "Evans, Bill" <Bill.Evans@hq.doe.gov>
Date: Tue, 30 Aug 2005 16:32:54 -0400
Delivery-date: Tue, 30 Aug 2005 22:07:14 +0100
Envelope-to: nv-l-archive@lists.skills-1st.co.uk
Reply-to: nv-l@lists.us.ibm.com
Sender: owner-nv-l@lists.us.ibm.com

I’m getting a different interesting result with authentication traps.  NV 7.1.4 FP03 RH 3


TCPDUMP shows me problems where the community string is not present in the request, the packet is flagged as having a bad ucp checksum and the router end sends in traps and log entries claiming it’s an authentication failure. Sometimes I get flagged with a bad upd checksum even when there is a community string.  


The visible result is that the  map turns red because the particular cisco 6000 series device is not successfully polled.  This happens intermittently; every couple days as a rule.  Here’s a sample:


22:08:24.225152 goshawk2.41186 > A0346K2.snmp: 

                { SNMPv1 C=CommString { GetRequest(33) R=1221173957 

                interfaces.ifTable.ifEntry.ifAdminStatus.341[|snmp]} } 

                (DF) (ttl 64, id 0, len 445)

22:08:24.227560 A0346K2.snmp > goshawk2.41185: 

                { SNMPv1 C=CommString { GetResponse(33) R=1221173956 

                interfaces.ifTable.ifEntry.ifAdminStatus.1=1} } 

                (ttl 255, id 22797, len 421)

22:08:24.229023 goshawk2.41187 > A0346K2.snmp: 

                { SNMPv1 C=CommString { GetRequest(33) R=1221173958 

                interfaces.ifTable.ifEntry.ifAdminStatus.224[|snmp]} } 

                (DF) (ttl 64, id 0, len 331)

22:08:24.230614 A0346K2.snmp > goshawk2.41186: 

                { SNMPv1 C=CommString { GetResponse(33) R=1221173957 

                interfaces.ifTable.ifEntry.ifAdminStatus.341=0} } 

                (ttl 255, id 22798, len 425)

22:08:24.231945 A0346K2.snmp > goshawk2.41187: 

                { SNMPv1 C=CommString { GetResponse(33) R=1221173958 

                interfaces.ifTable.ifEntry.ifAdminStatus.224=1} } 

                (ttl 255, id 22799, len 316)

22:08:42.085860 goshawk2.35443 > A0346K2.snmp: [bad udp cksum 51e3!] 

                { SNMPv1 { GetRequest(27) R=104669

                interfaces.ifNumber.0} }  (DF) (ttl 64, id 15988, len 70)

22:08:45.441257 goshawk2.35443 > A0346K2.snmp: [bad udp cksum 51e3!] 

                { SNMPv1 { GetRequest(27) R=104669 

                interfaces.ifNumber.0} }  (DF) (ttl 64, id 16057, len 70)

22:08:47.728274 goshawk2.35443 > A0346K2.snmp: [bad udp cksum 51e3!] 

                { SNMPv1 { GetRequest(27) R=104669 

                interfaces.ifNumber.0} }  (DF) (ttl 64, id 16090, len 70)

22:11:40.500053 goshawk2.35443 > A0346K2.snmp: [bad udp cksum f7e0!]

                { SNMPv1 { GetRequest(27) R=105016 

                system.sysObjectID.0} }  (DF) (ttl 64, id 16358, len 70)

22:11:42.510787 goshawk2.35443 > A0346K2.snmp: [bad udp cksum f7e0!] 

                { SNMPv1 { GetRequest(27) R=105016 

                system.sysObjectID.0} }  (DF) (ttl 64, id 16359, len 70)

22:11:44.509804 goshawk2.35443 > A0346K2.snmp: [bad udp cksum f7e0!] 

                { SNMPv1 { GetRequest(27) R=105016 

                system.sysObjectID.0} }  (DF) (ttl 64, id 16360, len 70)

22:11:46.518786 goshawk2.35443 > A0346K2.snmp: [bad udp cksum d38b!] 

                { SNMPv1 C=CommString { GetRequest(27) R=105016 

                system.sysObjectID.0} }  (DF) (ttl 64, id 16364, len 72)

22:11:46.520002 A0346K2.snmp > goshawk2.35443: [udp sum ok] 

                { SNMPv1 C=CommString { GetResponse(36) R=105016 

                system.sysObjectID.0=E:cisco.1.400} }  (ttl 255, id 24865, len 81)

22:11:46.521230 goshawk2.35443 > A0346K2.snmp: [bad udp cksum cf8c!] 

                { SNMPv1 C=CommString { GetRequest(27) R=105020 

                system.sysDescr.0} }  (DF) (ttl 64, id 16365, len 72)

22:11:46.521964 A0346K2.snmp > goshawk2.35443: 

                { SNMPv1 C=CommString { GetResponse(33) R=105020 

                system.sysDescr.0="C"} }  (ttl 255, id 24866, len 336)

22:11:46.522574 goshawk2.35443 > A0346K2.snmp: [bad udp cksum ce88!] 

                { SNMPv1 C=CommString { GetRequest(27) R=105021 

                system.sysName.0} }  (DF) (ttl 64, id 16366, len 72)

22:11:46.523144 A0346K2.snmp > goshawk2.35443: 

                { SNMPv1 C=CommString { GetResponse(37) R=105021 

                system.sysName.0="A0346K2.nm"} }  (ttl 255, id 24867, len 92)

22:11:46.523689 goshawk2.35443 > A0346K2.snmp: [bad udp cksum ca8c!] 

                { SNMPv1 C=CommString { GetRequest(27) R=105022 

                ip.ipForwarding.0} }  (DF) (ttl 64, id 16367, len 72)


These periods of missing community strings are always associated with reported (false) router critical states. I’ve been capturing tcpdump and netmon traces with an eye to opening a PMR.  Any ideas or similar symptoms from a different cause? 



Bill Evans


-----Original Message-----
From: owner-nv-l@lists.us.ibm.com [mailto:owner-nv-l@lists.us.ibm.com] On Behalf Of Glen Warn
Sent: Tuesday, August 30, 2005 2:40 PM
To: nv-l@lists.us.ibm.com
Subject: [nv-l] Authentication failure traps from Windows clients


Running 7.1.4 FP3 on Redhat AS2.1

I am being bombarded with auth failure traps from some of my Windows 200x servers  (not even a majority).  Odd part is I can do a demand poll and run a sniffer trace at the same time.  I see the poll run successfully (using the appropriate RO community string) then the same server issue an auth failure trap back to Netview (I have all my servers set to do this so I can detect rogue queries)  None of my traces reveal any other boxes trying to run queries (what I had assumed in the beginning)


I think this has been happening for a long time (all along?) but just became aware of a big problem because I accidentally hidden from myself thru event configuration (setting to "Don't display or Log") that I used a long time ago to debug something but never reverted. 


Any ideas?  I have tried changing the comm strings to something basic, put in a host specific snmp config, etc.  The devices are scattered across 5 different companies and dozens of subnets.


In the mean time, I believe this flood of traps is severely hampering Netviews ability to process other traps (because there are so many coming in non-stop)


Glen Warn

PEMCO Corporation Computer Services (PCCS)




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