Re: Denial of service attacks apparently from UUNET Netblocks

From: Dan Foster (no email)
Date: Tue Oct 07 1997 - 07:01:34 EDT


Hot Diggety! Doug Davis was rumored to have said...
> 19:56:56.854432 snap 0:0:0:8:0 37.31.237.183.1900 > 206.66.14.112.57039: S 674719801:674719801(0) win 65535 (ttl 21, id 13333)
> 19:56:56.854432 snap 0:0:0:8:0 76.167.191.100.1900 > 206.66.14.112.57040: S 674719801:674719801(0) win 65535 (ttl 21, id 13334)
> 19:56:56.854432 snap 0:0:0:8:0 131.254.10.213.1900 > 206.66.14.112.57041: S 674719801:674719801(0) win 65535 (ttl 21, id 13335)
> 19:56:56.855409 snap 0:0:0:8:0 74.60.41.73.1900 > 206.66.14.112.57042: S 674719801:674719801(0) win 65535 (ttl 21, id 13336)

Ouch...painful. A whole lot of SYNs with forged source address, eh? Hmm...
interesting. Karl, if I might ask - did your attack originate from any specific
port, like 1900 as is listed here?

I'm just curious since I'd like to get a rough idea if there's some program
other than smurf.c out there that makes use of a specific port by default,
or if this is just a one time occurence by a few separate idiots.

And as usual, thanks for the heads up from folks on NANOG.

-Dan Foster
Frontier Internet
Internet:








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