Date: Mon, 22 Apr 1996 12:23:46 GMT From: nnd@itfs.nsk.su (Nickolay N. Dudorov) To: hackers@freebsd.org Subject: Re: ip-in-ip tunnel Message-ID: <Dq9Jrn.LKB@itfs.nsk.su> References: <m0u9VAE-0009paC@methan.chemie.fu-berlin.de>
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Dirk Froemberg (dirk@methan.chemie.fu-berlin.de) wrote: > Hello! > > We need to set up a ip-in-ip (protocol number 4) tunnel with FreeBSD > (i. e. tunnel entry should be on a FreeBSD machine). > > Unfortunaly there seems to be no easy way of doing so. > > mrouting has the functionality of tunneling being limited on multicast > addresses. Although this limitation may easily be removed there > is no way of adding routes manually (e. g. route add). > > Another approach might be to create a interface doing the encapsulation. > The implementation of the ip-in-ip-encapsulation itself is not very > difficult. At the moment we are a stucked "a little bit" in the > BSD-networking-code. > > Btw. Linux has such interface called "tunl". > > Is anyone working on this? > I've send 'a problem report' with send-pr with example of program which configure tunN device as a point-to-point interface between this host and target one. It uses ip-over-ip encapsulation (protocol 94) - the same which is used by CISCO-routers (among others, they named it NOS-encapsulation) and (may be) Linux. N. Dudorov
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