From: Danny.Andaluz@triaton-na.com
Date: Thu Aug 28 2003 - 12:09:57 GMT-3
Hi, Raj. What I was saying was to turn on accounting on the last router that would reflect the original source before the traffic reaches the pix.
Check the diagram on the following link:
http://mywebpages.comcast.net/dannyandaluz/ipaccounting.jpg <http://mywebpages.comcast.net/dannyandaluz/ipaccounting.jpg>
Danny
-----Original Message-----
From: Rajagopal S [mailto:raj_ccie@yahoo.com]
Sent: Thursday, August 28, 2003 4:47 AM
To: Andaluz, Danilo, Triaton/NA; ccielab@groupstudy.com
Subject: RE: NACHI !!!
Hi Danny,
The PIX is sitting in between the router and the switch and doing a PAT. The ip accounting on the router shows huge traffic from the PAT IP. This will not reflect the original source.
I'll not be able to turn on ip accounting or cache flow on the VLAN interfaces.
Cheers
Raj
Danny.Andaluz@triaton-na.com wrote:
Raj,
What do here to identify infected machines, is to turn on ip accounting on the last internal router's outbound interface facing our firewall. If you see many entries for one packet from one source and they are the same byte count and they are sending to many different IP's, that machine is infected.
HTH,
Danny
-----Original Message-----
From: Rajagopal S [mailto:raj_ccie@yahoo.com <mailto:raj_ccie@yahoo.com> ]
Sent: Wednesday, August 27, 2003 10:30 AM
To: ccielab@groupstudy.com
Subject: NACHI !!!
Hi guys,
Nachi virus stroke my network. My router melted down after the attack.
As such, there are huge no of PC's sitting on the inside interface of the firewall. the router having the internet link is sitting on the outside interface of the firewall.
The internal users/servers are connected to the PIX via a 4507 internal L3 switch.
I have identified the traffic coming from inside to outside on port 0800 (icmp type 8 packet) from the patted IP to some arbitarty IPs on internet. I have blocked icmp on PIX and stabilised the situation.
But I still am not sure, which hosts on the internal network is pushing this traffic (ie affected with nachi). Am ready to put nachi patches in all the 500 odd machines, but is a bit tough !!!
Is there any way to find the machine pumping this traffic from the switch ? am not able to enable ip route-cache flow or ip accounting on the vlan interface nor able to enable MLS. Is there any other way to see this information?
Cheers
Raj
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