Bugtraq mailing list archives
Re: Reachable addresses on the net (was SYN floods)
From: mouse () Holo Rodents Montreal QC CA (der Mouse)
Date: Tue, 3 Sep 1996 06:45:11 -0400
As you can see, the address space is still quite sparse (less than 1 out of every 200 addresses is reachable in my test), with most being inside the 127 net.
...and the 127-net addresses are all hitting your local loopback anyway. So the address space is even sparser than .5%. You're also hitting a lot of unallocated address space - most of the class A space, for example, is unallocated. I'd be interested to see this done with the addresses probed restricted to allocated space. If nothing else it'd give some idea just how wastefully address space is currently being used. Perhaps I'll even do it myself.
At least for the purpose of SYN flooding, the assumption that a random address is unreachable is probably safe and probably quite useful. Any local protection has to bear this in mind, and perhaps keep a cache of known good addresses handy.
I'm not quite sure what such a cache would be good for.
Content-Type: TEXT/PLAIN; charset=US-ASCII; name=randping Content-Transfer-Encoding: BASE64
If it's in US-ASCII, why BASE64 it? Not that it matters; I just find it curious. der Mouse mouse () rodents montreal qc ca 01 EE 31 F6 BB 0C 34 36 00 F3 7C 5A C1 A0 67 1D
Current thread:
- Re: Reachable addresses on the net (was SYN floods) Jared Mauch (Sep 02)
- <Possible follow-ups>
- Re: Reachable addresses on the net (was SYN floods) der Mouse (Sep 03)
- Re: Reachable addresses on the net (was SYN floods) Alan Brown (Sep 05)
- [linux-security] samba 1.9.16p2-2 (RedHat): Damn /tmp security Zygo Blaxell (Sep 10)
- Re: Reachable addresses on the net (was SYN floods) Oliver Xymoron (Sep 03)
- Re: Reachable addresses on the net (was SYN floods) Oliver Xymoron (Sep 03)
- Re: Reachable addresses on the net (was SYN floods) Alan Cox (Sep 04)
- quick and dirty x-protect *Hobbit* (Sep 04)
- Re: Reachable addresses on the net (was SYN floods) Charles M. Hannum (Sep 10)