Is that a variant of Nachi B. ? The source address may be generated. joe --- Robert Scott <robert@mail.ucf.edu> wrote:
The University of Central Florida has seen a sudden jump in tcp 445 denies. It began a little after 9:00 AM EDST. New Worm?
I am denying about 32 thousand packets per second. IP Cache flow show them well spread over a wide range of addresses, targeted at what apeears to be a random sample of my class B. The ACL on our border router is taking 21 million denies every 10 minutes.
60 deny tcp any any eq 445 (346740094 matches)
The packets are small, since I am seeing a large nuber of packets, but the bit count is low. 30 second input rate 72679000 bits/sec, 41033 packets/sec 30 second output rate 29208000 bits/sec, 7687 packets/sec Input bits per second are a little above normal, but the packet count would normally be under 10000 not 41000.
Ideas?
TIA
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Robert D. Scott Associate Director Computer Services and Telecommunications Network Operations University of Central Florida Robert@mail.ucf.edu CSB-310 407-823-0662 Voice 407-823-5476 FAX 345-0662 Sun-Com 877-549-5390 Pager
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