Re: [Tsvwg] WGLC for Port Randomization starts now (April 1st)

[Joe Touch <[e-mail]>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1



Anantha Ramaiah (ananth) wrote:
> Yep, I stand corrected on that point (Randy did point to me the same),
> agreed,  the chances of collision are more compared to sequential. As
> far as port reuse is concerned, the key point is that in case of TCP it
> is a 16 bit number (since TCP doesn't have any extra mechanism to
> discard duplicates) whereas in SCTP it is 32 bit number (vtag). Pl see
> my other post.

In TCP, for a single socket pair, it is a 0-bit number.

In TCP, for arbitrary source IP addresses and services, over arbitrary
ports, it is at least 64 bits (plus more bits if the local host has
multiple IP addresses).

In SCTP, if you hold *just* the vtag, it's 32 bits, which is *lower*
than TCP in the second case above.

Joe
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkoemJQACgkQE5f5cImnZruhYwCgg/jMzRcrqQFzOWnkQl97wSZt
0N8AoNQ/0bhLPRmcX0rfzBgDb/zn6sDF
=1sQR
-----END PGP SIGNATURE-----