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FreeBSD Security Archives: Re: How to prevent motd including os

Re: How to prevent motd including os info


Garrett Wollman (wollmankhavrinen.lcs.mit.edu)
Sun, 12 Sep 1999 21:10:47 -0400 (EDT)


<<On 12 Sep 1999 18:47:23 +0200, Dag-Erling Smorgrav <desflood.ping.uio.no> said:

> +tcp_drop_synfin="NO" # Set to YES to drop TCP packets with SYN+FIN
> + # NOTE: this breaks rfc1644 extensions (T/TCP)

No, it breaks TCP, period, regardless of RFC 1644. Christmas-tree
segments are perfectly valid in TCP (i.e., SYN URG PSH FIN).

-GAWollman

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Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
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