Saturday, April 7, 2018

Routing loop?

Hello,

I'm thinking about a setup. There's something I don't like. Let's start with what we have:

  • 800 virtual machines sitting in subnet 10.70.0.0/22, each with its default gateway pointing to 10.70.0.70. There are multiple layer2 switches in 10.70.0.0/22, where the physical hosts are connected to.

  • The IP address 10.70.0.70 is configured on a layer3 switch. All mentioned layer2 switches are connected to it. On the layer3 the default route points to another layer3 switch with IP address 10.70.0.71.

  • The layer3 switch with IP address 10.70.0.71 is the actual gateway to other subnets.

  • So what is the actual traffic flow? A server starting a connection with an external subnet will push its traffic to 10.70.0.70, which will push it to 10.70.0.71. As 10.70.0.71 is in the same VLAN as the server, it will directly talk to the server after the first contact? But still there's the gateway actually sitting on the other/wrong switch...

What do you think?



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