New Router, Small Problem

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  • mmartell
    Badcaps Legend
    • Oct 2013
    • 3189
    • Canada

    #21
    Re: New Router, Small Problem

    Geez how much code is involved in saying "we have a request for address 'My-PC' let's check against our DHCP list and - oh we have a match for that here's the ip address we assigned based on that mac." Something doesn't add up.

    Comment

    • mmartell
      Badcaps Legend
      • Oct 2013
      • 3189
      • Canada

      #22
      Re: New Router, Small Problem

      Originally posted by retiredcaps
      A quick search shows that both the above routers can run openwrt and possibly lede. openwrt -> lede, but now rumors they are going to merge back again later this year.

      I normally go retrieve "old" routers if the person discarding is within 10 minutes of me and load openwrt/lede. I use them at home and give them away to friends and family to replace their old outdated router software.
      I looked up ddwrt for the E4200 when I first got it and only the v1 was hackable as it was Broadcom based and the v2 wasn't. Was my understanding the Asus is based on ddwrt or openwrt so no real reason to flash.

      Comment

      • retiredcaps
        Badcaps Legend
        • Apr 2010
        • 9271

        #23
        Re: New Router, Small Problem

        Originally posted by mmartell
        Geez how much code is involved in saying "we have a request for address 'My-PC' let's check against our DHCP list and - oh we have a match for that here's the ip address we assigned based on that mac." Something doesn't add up.
        Not a lot of code, but potential security problems with this type of DNS cache behaviour.
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        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271

          #24
          Re: New Router, Small Problem

          Originally posted by mmartell
          I looked up ddwrt for the E4200 when I first got it and only the v1 was hackable as it was Broadcom based and the v2 wasn't. Was my understanding the Asus is based on ddwrt or openwrt so no real reason to flash.
          The last time I ran dd-wrt was on some older Linksys WRT54G and dd-wrt was last updated back in Sept 2011? That is what lead me to openwrt and lede. I won't be running router code that is 6 years old.
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          • retiredcaps
            Badcaps Legend
            • Apr 2010
            • 9271

            #25
            Re: New Router, Small Problem

            Lede supports E4200 with 17.01.1 just released April 2017

            https://lede-project.org/toh/start?d...del*~%5D=e4200

            Same for Asus

            https://lede-project.org/toh/start?d...l*~%5D=RT-N56u

            So you can reuse these two routers with up to date code, security patches, etc from lede.

            17.01.1 is what I run at home on my own router (a freebie deemed too old).
            Last edited by retiredcaps; 05-16-2017, 08:02 AM.
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            • EasyGoing1
              Shock Therapist
              • Sep 2016
              • 977
              • USA

              #26
              Re: New Router, Small Problem

              Originally posted by mmartell
              These DNS entries were stored on the router itself ?
              YES, most modern routers act as a DNS relay server for your private network, which simplifies the configuration of the router for the ISP. But inherent in that service is the ability to collect the NETBIOS names of the computers on your network that get an IP address from the router and allow you to reference other machines by their NETBIOS name.

              If you had Windows configured the same on all the windows computers, you wouldn't need DNS to do this for you as it would be handled via broadcast packets in the background of Windows.

              I'm thinking its possible that you configured a domain name in your old router. Fire it up and look at the config ... most likely in the DHCP config page... look for a domain name ... if there is one there, then make sure the new router has that same domain name in it and things should start working as they did before ... but thats just a hunch on my part.

              Mike
              sigpic

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              • televizora
                ghettomodmaster
                • Nov 2016
                • 957
                • Bulgaria

                #27
                Re: New Router, Small Problem

                No DNS in local networks, unless there is a DNS server.
                You have to have running "Client for Microsoft networks" and enabled NETBIOS in order Windows computers to broadcast their names in the network. For your Linux computer, you must have SAMBA installed and configured.
                If something is not working properly, then blame your router. Are there any network filters enabled in the router configuration?
                Useful conversions. I don't "speak" imperial. Please use metric, if you want to address me.
                1km=1000m=100000cm, 1inch=2.54cm, 1mile=1609.344meters, 1ft=30.48cm 1gal(US)=3.785liters, 1lb=453grams, 1oz=28.34grams

                Comment

                • eccerr0r
                  Solder Sloth
                  • Nov 2012
                  • 8682
                  • USA

                  #28
                  Re: New Router, Small Problem

                  Netbios name and DNS name are different entities and can even be different though not recommended.
                  Windows and other DHCP clients can send a name while requesting DHCP - in Windows case, it's the Netbios name. It's up to the DHCP server to configure the DNS cache of it requested name. This is not a feature all DHCP-DNS servers have.
                  Last edited by eccerr0r; 05-17-2017, 09:15 AM.

                  Comment

                  • Per Hansson
                    Super Moderator
                    • Jul 2005
                    • 5895
                    • Sweden

                    #29
                    Re: New Router, Small Problem

                    Originally posted by eccerr0r
                    BTW, DNSMASQ, which is used on GPL firmware http://www.thekelleys.org.uk/dnsmasq/doc.html supports "Type 1" so I suspect later versions of DD-WRT support this. The "importing names from the DHCP subsystem" is the feature that's wanted though how you configure this through the GUI is implementation specific...

                    And yes this runs on your router. So if you can't hack your router, no point in proceeding further with this...
                    Yep, DD-WRT has supported it a looong time.
                    See screenshot:
                    Attached Files
                    "The one who says it cannot be done should never interrupt the one who is doing it."

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