Snort mailing list archives
A little help with an alert
From: "Terry Carlton" <lists () ironcomet com>
Date: Tue, 29 Oct 2002 13:01:39 -0500
Hello all. I have two Snort sensors on my network. The first is on a IPCop firewall at the perimeter. The second is behind the firewall and it catches everything on the inside. On the inside, I am running Snort 1.9 and the IPCop box is 1.8. I have a strange alert that is popping up in record numbers. This is from the IPCop Snort logs- Date: 10/28 10:20:43 Name: ICMP Source Quench Priority: 2 Type: Potentially Bad Traffic IP info: 193.171.121.21:n/a -> 65.xxx.xxx.xxx:n/a References: none found Date: 10/28 10:36:29 Name: ICMP Source Quench Priority: 2 Type: Potentially Bad Traffic IP info: 193.171.121.21:n/a -> 65.xxx.xxx.xxx:n/a References: none found Date: 10/28 10:39:59 Name: ICMP Source Quench Priority: 2 Type: Potentially Bad Traffic IP info: 193.171.121.21:n/a -> 65.xxx.xxx.xxx:n/a References: none found Date: 10/28 10:40:52 Name: ICMP Source Quench Priority: 2 Type: Potentially Bad Traffic IP info: 193.171.121.21:n/a -> 65.xxx.xxx.xxx:n/a References: none found Then, my internal Snort logs show the following- [**] [1:408:4] ICMP Echo Reply [**] [Classification: Misc activity] [Priority: 3] 10/29-12:44:43.426212 0:3:B3:0:43:2A -> 0:20:78:CF:9:33 type:0x800 len:0x62 193.171.121.21 -> 10.xxx.xxx.xxx ICMP TTL:233 TOS:0x0 ID:33631 IpLen:20 DgmLen:84 Type:0 Code:0 ID:512 Seq:2048 ECHO REPLY [**] [1:408:4] ICMP Echo Reply [**] [Classification: Misc activity] [Priority: 3] 10/29-12:44:43.437976 0:3:B3:0:43:2A -> 0:20:78:CF:9:33 type:0x800 len:0x62 193.171.121.21 -> 10.xxx.xxx.xxx ICMP TTL:233 TOS:0x0 ID:33634 IpLen:20 DgmLen:84 Type:0 Code:0 ID:512 Seq:2816 ECHO REPLY [**] [1:408:4] ICMP Echo Reply [**] [Classification: Misc activity] [Priority: 3] 10/29-12:46:55.835954 0:3:B3:0:43:2A -> 0:20:78:CF:9:33 type:0x800 len:0x62 212.199.187.134 -> 10.xxx.xxx.xxx ICMP TTL:109 TOS:0x0 ID:12833 IpLen:20 DgmLen:84 Type:0 Code:0 ID:512 Seq:3072 ECHO REPLY I did a Google search and came up with some Snortsnarf pages that contained this IP with the same type of traffic. I realize that these are ping replies, but what is pinging this site that is causing this? I am on a switched network, so I am installing Ethereal on some of the machines to see if they are generating the alerts. Is anybody able to help a little on this? Thank you. Terry ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
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- A little help with an alert Terry Carlton (Oct 29)