Hi All, Thanks for the posts they helped isolate the problem to a UDP syn attack. Now I have another question! Just after looking at this I had another router on my network, 7513 256MB Ram, reset 5 times and then Administratively shut down 5 my 8 port E1's. This has been also occuring sporadically but over a 3 month period. The difference between the routers is that this one is fully populated. The similarity is the above specs with HSSI ports. Any ideas? Is this also a hacker problem or is this a physical problem. Thanks Savvas _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]