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    SubjectRe: T/TCP: Syn and RST Cookies
    > Date:	Sun, 12 Apr 1998 01:44:27 -0700
    > From: "David S. Miller" <>
    > Date: Sat, 11 Apr 1998 18:16:19 -0700
    > From: Jim Dennis <>
    > Is T/TCP (RFC1644) implemented in the Linux kernel?
    > No, and until it is at least a real RFC standard, it won't be.

    It is not implemented per se, but there exists support for
    receiving data (Push) with connection startup SYN packet.

    This means that lattest 2.1.* kernels will do something sensible
    with incoming T/TCP packet. It does not mean there exists
    T/TCP support. Especially it does NOT mean that there exists
    user-space support for T/TCP per RFC 1644, or its FreeBSD
    implementation thereof.

    Systems that don't support T/TCP are known to behave at least
    erratically. Some systems even appear to HANG for a while when
    they receive T/TCP SYN+Push. Most systems will just send back
    SYN+ACK, and wait for the third ACK to establish the connection.

    /Matti Aarnio <>

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