nanog mailing list archives
Re: Port 25 filters - how many here deploy them bidirectionally?
From: "Christopher L. Morrow" <christopher.morrow () mci com>
Date: Sun, 09 Jan 2005 16:25:43 +0000 (GMT)
On Sun, 9 Jan 2005, Suresh Ramasubramanian wrote:
.. and if it has been tried, have you noticed any issues with this? 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.
...description of 'fantasy mail' removed...
So, a quick poll .. how many ISPs here have noticed this behavior, and applied bidirectional filters? And if they've applied port 25 filters bidirectionally, have they noticed any problems with this setup?
I believe reseller contracts have included this for over 2 years now, John StClair's efforts to get these in place are the primary reason they exist for our customers.
This ISP's post is only the second I've seen noting such behavior in a few months, the first being a nanog post in Aug 2004 by Hank Nussbacher - http://www.cctec.com/maillists/nanog/current/msg03171.html
We'd first seen this behaviour over 2 years ago... quite a bit actually over that time as the filters had been put into place. -Chris
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)