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Special Forums IP Networking Routing by connection tracking Post 302527176 by michas on Thursday 2nd of June 2011 05:55:42 PM
Old 06-02-2011
Routing by connection tracking

Hello,

I have switch port, that allows only a single MAC/IP connected to it. - But, I would like to connect two hosts, without any additional private network. (No NAT.)

Therefore the plan is adding a linux router doing proxy-arp with three interfaces, one for host1, one for host2 and one for the remaining LAN.

Now I would like to give both hosts the same IP address and use connection tracking to route a packet to host2 if and only if the connection was initiated by host2 itself.

Therefore, for both the hosts and the LAN, it should look like there is only one single host on my side.

What is the right way to do this?

Shouldn't it be possible to simply mark a connection initiated by host2 with CONNMARK and afterwards use policy routing to route all packages of marked connection to host2? (Anyone already did such things?)

Are there more problems I do not see yet?

I'm pretty much sure, that I am not the first one trying to do such things. Do you have any pointers for me to read?

Last edited by michas; 06-03-2011 at 04:53 AM..
 

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ypset(1M)						  System Administration Commands						 ypset(1M)

NAME
ypset - point ypbind at a particular server SYNOPSIS
/usr/sbin/ypset [-d ypdomain] [-h host] server DESCRIPTION
In order to run ypset, ypbind must be initiated with the -ypset or -ypsetme options. See ypbind(1M). ypset tells ypbind to get NIS services for the specified ypdomain from the ypserv process running on server. If server is down, or is not running ypserv, this might not be dis- covered until an NIS client process tries to obtain a binding for the domain. At this point, the binding set by ypset is tested by ypbind. If the binding is invalid, ypbind attempts to rebind for the same domain. ypset is useful for binding a client node that is not on a broadcast net, or is on a broadcast net that is not running an NIS server host. It is also useful for debugging NIS client applications, for instance, where an NIS map exists only at a single NIS server host. Where several hosts on the local net are supplying NIS services, ypbind can rebind to another host, even while you attempt to find out if the ypset operation succeeded. For example, if you enter the ypset command below, you might get the subsequent response from ypwhich: example% ypset host1 example% ypwhich host2 The sequence shown above is a function of the NIS subsystem's attempt to load-balance among the available NIS servers, and occurs when host1 does not respond to ypbind because it is not running ypserv (or is overloaded), and host2, running ypserv, obtains the binding. server indicates which NIS server to bind to, and must be specified as a name or an IP address. This works only if the node has a current valid binding for the domain in question and ypbind has been set to allow use of ypset. In most cases, server should be specified as an IP address. ypset tries to bind over a connectionless transport. The NIS library call, yp_all(), uses connection-oriented transport and derives the NIS server's address based on the connectionless address supplied by ypset. Refer to ypfiles(4) for an overview of the NIS name service. OPTIONS
-d ypdomain Use ypdomain, instead of the default domain. -h host Set ypbind's binding on host, instead of locally. Specify host as a name. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnisu | +-----------------------------+-----------------------------+ SEE ALSO
ypwhich(1), ypfiles(4), attributes(5) SunOS 5.11 14 Sep 1992 ypset(1M)
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