DNS Servers on Local PCs

Discussion in 'Tomato Firmware' started by lexluthor, Mar 25, 2008.

  1. lexluthor

    lexluthor Network Guru Member

    I notice that Tomato is assigning my router IP as the DNS server to my local PCs.

    My PCs' DNS requests are going to the router and not to external DNS servers.

    When using QoS those requests are unclassified, instead of highest.

    Is that going to be a problem?

    Is there any way to have Tomato pass along the external DNS addresses to the PCs? I know I can manually set them on the PCs, but I'd rather have Tomato pass it along automatically.

  2. LLigetfa

    LLigetfa LI Guru Member

    The router doesn't have to be a caching DNS but I don't know why you would want to disable that option. No need to manually set DNS on the PCs.
  3. lexluthor

    lexluthor Network Guru Member

    So if i disable the caching DNS option, the router will give the PCs public IPs?

    I guess it's fine to have the router cache DNS, I'm just concerned that the DNS requests are not longer being treated as highest QoS level then, since it's PC to LAN traffic which is unclassified.

    Does that not matter then?
  4. LLigetfa

    LLigetfa LI Guru Member

    AFAIK if you disable the internal caching DNS the DNS you get from your ISP (DHCP) will be passed on to the clients. You can also hard code DNS in the router. I don't think QOS affects DNS traffic to/from your router.
  5. bigclaw

    bigclaw Network Guru Member

    I don't think that will be a problem. If you think about it,
    1) the router has no control when a client sends a request to the router. QoS has no effect there anyway. That's the reason why any communication between the client PCs and the router is unclassified.
    2) the router gets to prioritize an outbound request to the Internet. A DNS request, if going over to the Internet, will have a destination port of 53, and QoS will at that time assign a highest priority.
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