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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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aseqnet(1)						      General Commands Manual							aseqnet(1)

NAME
aseqnet - ALSA sequencer connectors over network SYNOPSIS
aseqnet [remotehost] DESCRIPTION
aseqnet is an ALSA sequencer client which sends and receives event packets over network. Suppose two hosts connected by network, hostA as a server and hostB as a client. The ALSA sequencer system must be running on both hosts. For creating the server port, run the following on hostA: hostA% aseqnet sequencer opened: 128:0 Then a user client 128 with port 0 was opened on hostA. (The client number may vary.) For creating the (network-)client port, run aseqnet with the hostname of the server: hostB% aseqnet hostA sequencer opened: 132:0 Now all events sent to hostA:128:0 are transferred to hostB:132:0, and vice versa. The ports created by aseqnet can be connected arbitrary to other sequencer ports via aconnect(1). For example, to connect hostB:132:0 to a MIDI output device 65:0: hostB% aconnect 132:0 65:0 Then events to hostA:128:0 will be delivered to hostB:65:0. The following command plays MIDI on hostB. hostA% pmidi -p 128:0 foo.mid The multiple clients may exist simultaneously. If hostC is connected as a client to hostA, events from from hostA are sent to all con- nected network clients, i.e. hostB and hostC. However, only one connection is allowed from a client to a server. To disconnect network, stop all clients before server by ctrl-C or sending signal to them. The server will automatically quit. OPTIONS
-p port Specify the TCP port number or TCP service name. -s addr Subscribe to the given address for read automatically. -d addr Subscribe to the given address for write automatically. -v Verbose mode. SEE ALSO
aconnect(1), pmidi(1) AUTHOR
Takashi Iwai <tiwai@suse.de>. January 1, 2000 aseqnet(1)
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