nanog mailing list archives
Re: Providers removing blocks on port 135?
From: "Ray Bellis" <rpb () community net uk>
Date: Sun, 21 Sep 2003 00:24:12 +0100
I would suggest instead that you have mandatory sending via your relays, and allow inbound connections to port 25.
We're a fairly big provider on the GRIC (global roaming) network. That means that it's not feasible for us to prevent many of our POPs' users from contacting off-net SMTP servers. Running an enforced SMTP service via transparent proxying wouldn't stop the spam problem, it would just shift it and probably get the proxy system black-listed as an open-relay's relay. Anyway, like I said, we don't *have* a spam problem on our dialups. By virtue of our filters we don't have any open relays on dialup. ADSL is a different matter and we do have occasional problems with open relays and/or worms there. Unfortunately the UK incumbent wholesaler(*) doesn't provide a way to filter ADSL traffic within their ATM core. The only way to do it is to put another router between our network and the "BT Central" router that connects their ATM cloud to us. Of course that doesn't provide any inter-customer filtering, since that traffic never reaches our network :( Ray (*) BT - they have a nearly complete monopoly on the local loop.
Current thread:
- RE: Providers removing blocks on port 135?, (continued)
- RE: Providers removing blocks on port 135? Justin Shore (Sep 19)
- RE: Providers removing blocks on port 135? Owen DeLong (Sep 19)
- RE: Providers removing blocks on port 135? Mark Borchers (Sep 19)
- Re: Providers removing blocks on port 135? bmanning (Sep 19)
- Re: Providers removing blocks on port 135? Sean Donelan (Sep 20)
- Re: Providers removing blocks on port 135? Owen DeLong (Sep 20)
- Re: Providers removing blocks on port 135? Rob Thomas (Sep 20)
- Re: Providers removing blocks on port 135? Owen DeLong (Sep 20)
- Re: Providers removing blocks on port 135? Ray Bellis (Sep 20)
- Re: Providers removing blocks on port 135? David B Harris (Sep 20)
- Re: Providers removing blocks on port 135? Ray Bellis (Sep 20)
- Re: Providers removing blocks on port 135? Niels Bakker (Sep 20)
- Re: Providers removing blocks on port 135? Richard Cox (Sep 20)
- Re: Providers removing blocks on port 135? Margie (Sep 20)
- Re: Providers removing blocks on port 135? Andy Walden (Sep 20)
- Re: Providers removing blocks on port 135? Margie (Sep 20)
- Re: Providers removing blocks on port 135? Jack Bates (Sep 22)
- Re: Providers removing blocks on port 135? Sean Donelan (Sep 20)
- Re: Providers removing blocks on port 135? Justin Shore (Sep 20)
- Any actual data to back up blocking Netbios ports? Sean Donelan (Sep 20)
- Re: Providers removing blocks on port 135? John Kristoff (Sep 21)