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weird pix issue

Posted on 2009-04-05
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Last Modified: 2012-05-06
I had a pix firewall operating in a live environment till everybody reported that things are down .. when i consoled into the pix, running config was fine and all static routes were already there ... all interfaces were up/up ... But this is what was weird .. If i would ping to any directly connected interface of the pix (whether that be the router on its inside or its pix's gateway i.P) it would straight away come up with ????? ...Usually it tries and waits and goes slowly, ? then in a couple of seconds, ? and so on ... but this time it displayed all 5 question marks ????? in 1 sec as if its not even trying to attempt to ping ....
I had to restart the pix to get over this issue ... but i mean can somebody tell me if there is anything with the pix firewalls in general like this...was this some kind of a DOS attack ? what was it !
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Question by:nabeel92
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Expert Comment

by:debuggerau
ID: 24074357
sure can be, I'd suspect it is not the latest firmware, a late version 7 or version 8..

I'm assuming it is set up securely though...
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Author Comment

by:nabeel92
ID: 24074496
It's the latest version ...
Relevant ACL is applied at the outside interface protected the inside and DMZ network ...
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Author Comment

by:nabeel92
ID: 24074498
Version is 8.0
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Expert Comment

by:debuggerau
ID: 24074578
have you a syslog server to check the logs?

What other equipment may have had an impact, like a layer 3 switch or something?

not over-driving it either?
Enough memory? Not too many features enabled for its power?

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Author Comment

by:nabeel92
ID: 24074600
nah, its a new network and yet to design an SNMP system...All other equipments were fine. Pix was not even able to ping its directly connected router. No abnormal Spike in CPU or memory usage on PIX as well. I know its one of the most weird issues I've come across and been googling and trying to find answer on cisco as well but no joy !
Ok, it would have made sense if it would come up with Not enough memory, or if there was a spike in CPU usage coz those 2 ive seen are always the symptoms of the DOS attack but it was just fine when i was consoled into the PIX....
Could it be those Chinese hackers that are active nowadays ? lolz ...
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Accepted Solution

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debuggerau earned 500 total points
ID: 24083093
I doubt it would have been, but the amount of 'noise' out there could have exposed you to an unknown bug which stopped the ports..

No one was doing a ARP scan on your network?
Some switches only support a maximum of 3 MACS per port, or similar, and they can go off if there is an ARP scan..

Do you have ARP proxy set?

No one provided a loop-back cable, where none was needed? That could have frozen the port from the spanning tree protocol on the switch..

Running out of suggestions, and since the moment has passed, I suppose we will never know for certain, unless you setup your syslog, SMNP and monitoring software..






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