nanog mailing list archives
Re: IAB concerns against permanent deployment of edge-based filtering
From: Valdis.Kletnieks () vt edu
Date: Sat, 18 Oct 2003 17:55:29 -0400
On Sat, 18 Oct 2003 14:28:10 PDT, bmanning () karoshi com said:
... part of the INTERnet, and we would like it all to interoperate end to end.that must be the royal "we"...
Nope. The collective we. If you aren't in the set of people who wants things to interoperate, why are you subscribed to NANOG? ;)
if there is really a concern that port filtering is inherently bad and should only be exercised as a temporary expediant, then why not open up all ports on the end systems?
There's a distinction between filtering ports at the ISP and opening them up on the end systems, which you are trying to gloss over - when in fact the distinction is important.
blocking ports 5, 7, 9, 11 and 19 are fairly common these days. is the IAB seriously suggesting that ISPs remove the filters on/for these ports?
My machine is quite able to decide if it wants to accept traffic on those ports, or reject it with an appropriate error message, or silently discard it. In the unlikely event of a DDoS attack involving those ports, I will discuss mitigation with my provider. The only reason we're having this discussion is because there's a majority market share by vendors who have traditionally shipped systems that are unable to make reasonable decisions about accepting traffic (yes, vendors plural. Fortunately, most have recanted over the past few years). And yes, I read it as "the IAB is suggesting the time for filtering those ports is either passed or will soon be" - how many vendors are *still* shipping code that does the default things on those ports?
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Current thread:
- Re: IAB concerns against permanent deployment of edge-based filtering, (continued)
- Re: IAB concerns against permanent deployment of edge-based filtering E.B. Dreger (Oct 18)
- Re: IAB concerns against permanent deployment of edge-based filtering Randy Bush (Oct 19)
- Re: IAB concerns against permanent deployment of edge-based filtering bmanning (Oct 20)
- Re: IAB concerns against permanent deployment of edge-based filtering Randy Bush (Oct 20)
- Re: IAB concerns against permanent deployment of edge-based filtering Stephane Bortzmeyer (Oct 20)
- Re: IAB concerns against permanent deployment of edge-based filtering Owen DeLong (Oct 20)
- Re: IAB concerns against permanent deployment of edge-based filtering Howard C. Berkowitz (Oct 20)
- Re: IAB concerns against permanent deployment of edge-based filtering Pekka Savola (Oct 18)
- Re: IAB concerns against permanent deployment of edge-based filtering Valdis . Kletnieks (Oct 18)