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| Subject: | DoS/DDoS on port 1863(MSN protocol) |
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| Date: | Thu, 23 Sep 2004 13:01:05 -0300 |
Hi all, I work in an Satellite ISP(teleport) and we are experimenting a Dos/DDoS Attack in our routers on port 1863. Too much SYNs are being sent from a lot of our Public IP Customers to 1863 port to MSN Servers. 10.000 connections per seconds are generated in our TCP accelerators systems, and overflows this system and borders routers. We can identify the customers, but are too much. We cannot drop this port because MSN application uses and we cannot apply policies to our firewalls because the MSN Servers response to SYNs generated from our customers. We have Allot systems that perform filters by IP header, but really, we need to filter by application layer. Anybody has an idea to solve this problem? Tks in advance. Diego S. González Operations Team Telespazio Visit us @ http://www.finmeccanica.it Visit us @ http://www.telespazio.it
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