Tuesday, January 1, 2019

Multiple Public Static IPs for 1 Linux Server

Hello All,

We have a CentOS-7 linux box that is running a piece of web hosting software. We have three different ISPs and public static IP blocks from each of them. My linux box has 3 separate NICs. My goal is to be able to access the linux server from any of the 3 unique public static IP addresses (should one of the ISPs go down or fail).

I've gone ahead and assigned a Public Static IP from each ISP to a unique NIC port on the linux server. (NIC1 = Verizon, NIC2 = Crown Castle, NIC3= Cogent)

I'm having a problem getting connectivity working properly on NIC2/NIC3 and I believe this has something to do with routing tables not being configured correctly on the linux server.

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Anyone have experience setting up something like this?

Apologies if this is trivial, I'm not very familiar with routing tables.

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Thanks so much

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