Re: Re: ipip-tunnel specifications : where ?

From: Steve Meuse (mucpsm.shmi@relay.tunkki.fi)
Date: Mon Sep 18 2000 - 18:54:50 EEST

  • Next message: Mike Murphree: "Re: Re: ipip-tunnel specifications : where ?"

    It is IP protocol number 4, that is, it's on the same level in the stack as
    TCP or ICMP.

    -Steve

    At 06:40 AM 09/18/2000 -0700, Mike Murphree wrote:

    >What ports does this service use? I need to make
    >allowances for it in my firewall. Also does anyone
    >have any experience with using the FreeBSD 'nos-tun'
    >function with the Linux equivalent?
    >
    >Thanks,
    >Mike N4CNW
    >
    > > For RFC search :
    > > http://www.rfc-editor.org/cgi-bin/rfcsearch.pl
    > >
    > > Steve Meuse a écrit :
    > > >
    > > > At 07:12 PM 09/11/2000 +0200, Cees Tool wrote:
    > > > >Hi,
    > > > >
    > > > >I am trying to find the RFC or other document where the IPIP tunnel
    > protocol
    > > > >is described. I like to see how the frames look like.
    > > > >I did not have any luck searching on the internet yet, but maybe
    > someone has
    > > > >a URL of RFC number for me ??
    > > > >
    > > > >73
    > > > >Cees - PA3AES
    > > >
    > > > Just a quick search returned the following:
    > > >
    > > > 1853 IP in IP Tunneling. W. Simpson. October 1995. (Format: TXT=14803
    > > > bytes) (Status: INFORMATIONAL)
    > > >
    > > > 1. Introduction
    > > >
    > > > The IP in IP encapsulation Protocol/Payload number 4 [RFC-1700] has
    > > > long been used to bridge portions of the Internet which have disjoint
    > > > capabilities or policies. This document describes implementation
    > > > techniques used for many years by the Amateur Packet Radio network
    > > > for joining a large mobile network, and also by early implementations
    > > > of IP Security protocols.
    > > >
    > > > Use of IP in IP encapsulation differs from later tunneling techniques
    > > > (for example, protocol numbers 98 [RFC-1241], 94 [IDM91a], 53
    > > > [swIPe], and 47 [RFC-1701]) in that it does not insert its own
    > > > special glue header between IP headers. Instead, the original
    > > > unadorned IP Header is retained, and simply wrapped in another
    > > > standard IP header.
    > > >
    > > > This information applies principally to encapsulation of IP version
    > > > 4. Other IP versions will be described in separate documents.
    > > >
    > > > -Steve
    >
    >

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