• Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Search
  • Register
  • Login
Netgate Discussion Forum
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Search
  • Register
  • Login

Routing Public Subnets with 2 ISP's?

Scheduled Pinned Locked Moved Routing and Multi WAN
4 Posts 3 Posters 2.5k Views
Loading More Posts
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • W
    Wasca
    last edited by Jan 16, 2007, 5:13 AM

    Hi All

    I was planning on setting up a CARP cluster and using 2 ISP's for added redundancy.

    From each of the ISP's I would get 3 x public WAN Ip's. I also need a public /28 subnet from one of the ISP's, I was planning on putting the /28 on an optional interface.

    My question is this.

    If the /28 was from ISP #1 and ISP #1 goes down, how do I make sure I can still get to servers on the /28 over my connection with ISP #2?

    Is this even possible? How would ISP#2 even know I had that /28 network.

    My first thought is that ISP#2 would need to have a static route on their end pointing to the 3 WAN IP's I got from ISP #2, am I on the right track?

    Thanks for your help

    1 Reply Last reply Reply Quote 0
    • V
      valnar
      last edited by Jan 16, 2007, 4:45 PM

      You would need to run BGP with your own ASN number I think in order to route your public IP's over multiple providers.  An ISP provided network range typically will not route over another provider's network.

      Robert

      1 Reply Last reply Reply Quote 0
      • W
        Wasca
        last edited by Jan 17, 2007, 1:01 AM

        How do you get an ASN?

        Is the ASN then related to a public IP block?

        Thanks

        1 Reply Last reply Reply Quote 0
        • H
          hoba
          last edited by Jan 17, 2007, 9:43 AM

          I would recommend getting another subnet for the second ISP too. There are DNS-services that can check servers for responsability and switch the nameresolution to different IPs if the main IPs are not working anymore. This way clients would get the IPs of ISP2 resolved if ISP1 goes down. You even could do a loadbalancing between both ISPs this way. There are DNS-services supporting this too. I know scott is working on a dns-package for pfSense doing things like this. Afaik it's nearly done.

          1 Reply Last reply Reply Quote 0
          1 out of 4
          • First post
            1/4
            Last post
          Copyright 2025 Rubicon Communications LLC (Netgate). All rights reserved.
            This community forum collects and processes your personal information.
            consent.not_received