Comments on: How to route/switch between three different networks/interface through one interface? http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/ Tue, 21 May 2013 23:11:32 +0000 hourly 1 By: sixball http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/#comment-98478 sixball Mon, 31 Oct 2011 17:39:39 +0000 #comment-98478 You mentioned “The client and server HAS to be connected to the workstation, due to it is the only one that has a NIC capable of being connected to client/server.”

And the diagram shows the NICs as eth0-2. What type of physical connections are they using that is so proprietary that they cant inter-connect through the switch?

You show Eth2 connected to the switch. Are eth 0 and 1 not the same type of NIC?

]]> By: chippy088 http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/#comment-95468 chippy088 Thu, 18 Aug 2011 23:54:47 +0000 #comment-95468 whoops, that should have been -

I am a little confused why you have the switch connected to the router using 3 lines.

Could you explain why, as I think it is a waste of 2 ports.

]]> By: chippy088 http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/#comment-95467 chippy088 Thu, 18 Aug 2011 23:53:07 +0000 #comment-95467 I am a little confused why you have the switch connect using 3 lines.

Could you explain why, as I think it is a waste of 2 ports.

]]> By: petkoa http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/#comment-95441 petkoa Thu, 18 Aug 2011 17:22:04 +0000 #comment-95441 Is routing enabled on your Ubuntu box? E.g., by setting

net.ipv4.ip_forward = 1

in /etc/sysctl.conf (or wherever it should be set in Ubuntu to be persistent)

You can activate routing temporarily, of course, by

echo 1 > /proc/sys/net/ipv4/ip_forward

Don’t be confused by internet connectivity of virtual machines – they are not routed between physical interfaces, in fact they are NATted by virtualbox software.

Good luck

]]> By: t0mmy1e http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/#comment-95381 t0mmy1e Wed, 17 Aug 2011 17:27:10 +0000 #comment-95381 Hi CRagsdale,

Thank you for your response. Essentially, I want it to act like a hub, but am unable to. There are other virtual machines on the workstation, in which the client/server uses. The workstation is the only one that has the 10gb NICs. For certain test cases, the client/server HAS to go through the router, which is why SUT is on different subnet.

The workstation is running Ubuntu 10.04 Desktop. Other virtual machines exist on workstation, managed by virtualbox.

I have tried bridging the three interfaces together, which semi-works, but it seems to get confused with all the DUP traffic. Is there a more elegant way of doing this, besides bridging the three together? Maybe some configuration to specifically route traffic from one interface to the other?

Thanks!

]]> By: cragsdale32 http://itknowledgeexchange.techtarget.com/itanswers/how-to-routeswitch-between-three-different-networksinterface-through-one-interface/#comment-95377 cragsdale32 Wed, 17 Aug 2011 15:48:56 +0000 #comment-95377 just a thought, Why not use a hub instead of the workstation? I may have missed something in there but that’s what it sounds like you are doing anyways. Also, why not pout the SUT in-line between switch and workstation, If it’s physically possible at least.

Other questions I would have if none of the above were possible: What software are you using on the workstation? Are you just using the workstation as a router with something like PFSense or Samba Server?

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