nanog mailing list archives
Re: Port 25 filters - how many here deploy them bidirectionally?
From: John Levine <johnl () iecc com>
Date: 9 Jan 2005 17:20:10 -0000
Please consider the situation of net abuse with the source address being an infected PCs on a dialup pool that has port 25 filtering enabled. [ triangular routing ]
Back when Ernesto Haberli was active, this was his trademark technique. He'd burn through large numbers of dialup accounts, but hide the address of his high-speed connection. At the time he left the business a few years ago it worked pretty well and I gather he left because he'd run out of high speed ISPs to sign up with. I'd be interested to know if triangular routing is used by particular people now, or is it just another trick thrown into the mix along with zombie proxies and such. Regards, John Levine, johnl () taugh com, Taughannock Networks, Trumansburg NY http://www.taugh.com
Current thread:
- Port 25 filters - how many here deploy them bidirectionally? Suresh Ramasubramanian (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Subhi S Hashwa (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 25)
- Re: Port 25 filters - how many here deploy them bidirectionally? Subhi S Hashwa (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Christopher L. Morrow (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? John Levine (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Patrick W Gilmore (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Sean Donelan (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Suresh Ramasubramanian (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Todd Vierling (Jan 10)
- Re: Port 25 filters - how many here deploy them bidirectionally? Joe Rhett (Jan 11)
- Re: Port 25 filters - how many here deploy them bidirectionally? Todd Vierling (Jan 11)