Here's a sorted list of the networks used to attack FDT (pulled from my 1.5mb of tcpdump data which was just a brief sample of the data from our attack Sunday. If any of them belong to you, shame on you.
207.107.244
You are being hit through Sprint Canada. Four /30's from this class c are the addresses assigned to the 4 T1's we have with Sprint Canada. What specific addresses on this net hit you? We do source address filtering, and do not permit packets to leave our net which do not have source addresses on our nets. Having said that, the /30's I am concerned about do not appear anywhere but our core router. If your attack is coming from there, then I would likely to know what the h*ll our router is doing sending those packets, and who the h*ll has that kind of access to our router that we don't know about. Please confirm the actual source IP's on the 207.107.244 network. I also know of a Toronto ISP who has a /30 from this network for their link to Sprint Canada. Thx, dennis
On Tue, 12 Aug 1997, Dennis Simpson wrote:
Here's a sorted list of the networks used to attack FDT (pulled from my 1.5mb of tcpdump data which was just a brief sample of the data from our attack Sunday. If any of them belong to you, shame on you.
207.107.244
You are being hit through Sprint Canada. Four /30's from this class c are the addresses assigned to the 4 T1's we have with Sprint Canada.
What specific addresses on this net hit you? We do source address filtering, and do not permit packets to leave our net which do not have source addresses on our nets.
18:56:12.866177 207.107.244.14 > 205.229.48.20: icmp: echo reply (ttl 248, id 3392) 18:56:21.976177 207.107.244.18 > 205.229.48.20: icmp: echo reply (ttl 248, id 6747) Source filtering is not the issue. The issue is that someone pinged the broadcast address on these networks using a forged source address, and then all the hosts on the pinged networks respond to the forged source address, burrying it in icmp echo replies. It would be nice if everyone blocked broadcast pings from entering their networks. It would be nicer if these idiots found more constructive things to do with their time. ------------------------------------------------------------------ Jon Lewis <jlewis@fdt.net> | Unsolicited commercial e-mail will Network Administrator | be proof-read for $199/message. Florida Digital Turnpike | ______http://inorganic5.fdt.net/~jlewis/pgp for PGP public key____
participants (2)
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Dennis Simpson -
Jon Lewis