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

    Router's LAN plugged directly into the Internet (its public WAN)

    Scheduled Pinned Locked Moved Off-Topic & Non-Support Discussion
    2 Posts 2 Posters 2.2k 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.
    • A
      arriflex
      last edited by

      I know just enough about networking to believe that this is a bad idea.

      What happens when you plug the LAN (private subnet) from a router's integrated switch back into the WAN which is the internet. (In this case the router is assigned a public static IP and a CIDR of 28 bits if that helps describe the WAN)?

      I can't help but think that an ISP would be unhappy about having a DHCP server on their network. I also assume that devices (even if in a private subnet) would be subject to attack. It just seems wrong, but I can't really put my finger on why in a way that the person who did this is accepting.

      Suggestions on how to advise them to plug their Internet connection into the WAN port on their crappy router and leave the LAN isolated behind it? Or am I being naive and there's a reason to do what they're doing?

      arri

      1 Reply Last reply Reply Quote 0
      • M
        Metu69salemi
        last edited by

        At least ISP should be blocking private ip-areas and they should have protected dhcp services.

        Nevertheless that is always bad idea, unless you're having a router connected to public ip-area.

        1 Reply Last reply Reply Quote 0
        • First post
          Last post
        Copyright 2025 Rubicon Communications LLC (Netgate). All rights reserved.