nanog mailing list archives
Re: Open relays and open proxies
From: william+nanog () hq dreamhost com (Will Yardley)
Date: Thu, 24 Apr 2003 12:16:46 -0700
On Thu, Apr 24, 2003 at 02:11:12PM -0500, Adi Linden wrote:
I am seeing an increasing number of hosts on our network become an open proxy. So far the response to this has been reactive, once I receive complaints from spam victims I deal with the source of the problem. Is there an accepted way of blocking open proxy and open relay traffic at the network edge?
The obvious way would be to block the commonly abused ports... presumably, you will have very few customers who actually need to have port 1080, 3128 8080, or whatever open. Obviously, I can't say whether this would be effective for your particular application. Also, you could consider running proactive scans on your network with available proxy-checking tools. I use proxycheck to manually check hosts for open proxies (http://www.corpit.ru/mjt/proxycheck.html)... you could script this (or a similar tool) and run scans of your entire network. -- "Since when is skepticism un-American? Dissent's not treason but they talk like it's the same..." (Sleater-Kinney - "Combat Rock")
Current thread:
- Open relays and open proxies Adi Linden (Apr 24)
- Re: Open relays and open proxies Will Yardley (Apr 24)
- Re: Open relays and open proxies John Payne (Apr 24)
- Re: Open relays and open proxies Paul Vixie (Apr 24)
- Re: Open relays and open proxies John Payne (Apr 24)
- Re: Open relays and open proxies John Payne (Apr 24)
- Re: Open relays and open proxies Will Yardley (Apr 24)
- Re: Open relays and open proxies Richard Cox (Apr 24)
- Re: Open relays and open proxies Neil J. McRae (Apr 25)
- Re: Open relays and open proxies Roland Verlander (Apr 25)
- Re: Open relays and open proxies Paul Wouters (Apr 25)
- Re: Open relays and open proxies Jack Bates (Apr 25)
- Re: Open relays and open proxies Paul Vixie (Apr 25)
- Re: Open relays and open proxies Jack Bates (Apr 25)
- Re: Open relays and open proxies Neil J. McRae (Apr 25)