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RV082 v1.3.3.4DHCP

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by Dsnake, Sep 2, 2006.

  1. Dsnake

    Dsnake LI Guru Member

    In this firmware the DHCP give you the provider external dns @.
    The DNS Local Database become useless... am i missing something? it's a bug?
  2. Toxic

    Toxic Administrator Staff Member

    you must be missing something. as the download states the changes to the beta firmware. one of which is:

    6. Change the DHCP Server implementation. When the DHCP client requests the IP address of DNS server, RV082 will offer the DNS server address obtained from ISP. (In previous firmware, RV082 offers the DNS server address as RV082’s LAN IP.)

    dont ask me why they have implemented this but it would see strange what they have done. I have forwarded my views on this change and hope to get some answer back on this.
  3. YeOldeStonecat

    YeOldeStonecat Network Guru Member

    It is a performance advantage, IMO, to have workstations go directly to the ISP's DNS servers instead of flipping through the routers LAN IP.
  4. Dsnake

    Dsnake LI Guru Member

    I must desagree on that.
    First making it like they did will instan broke all the ppl that used the router as a smal dns server for they internal domain. who upgrade without checking.
    And for performance i assume the router has a cache, so actualy under eavy load it's a performance lost cause the dns querry will go to your isp using internet trafic and your isp dns will always respond slower than your router cache...

    I really can't understand why they did that, first time i see a ronter act like this... especialy the fact they keeped the option to put DNS entry who is completly useless if you use DHCP
  5. pablito

    pablito Network Guru Member

    A local DNS is much faster..

    There should be an option to use your own configured DNS server whether that be the router, internal DNS, or ISP. I've always run my own DNS servers and there is a definite performance advantage to a local DNS cache. Having everyone go to the ISP is much slower (xx-ms x 1000s is slower than .0x-ms + cache).

    For me the biggest downside to forcing an ISP DNS besides performance and reliability is for internal server resolution. I usually run dummy versions of my domains that will return the internal IPs of servers that are local. External users get the public IPs.

    Fortunately in my case I don't use the RV DHCP server since I'll run it on the internal server.
  6. YeOldeStonecat

    YeOldeStonecat Network Guru Member

    I don't believe it holds cache with proper forward and reverse lookup zones. And without Active Directory...workstations will broadcast for resolution and claim their own master browser through election anyways, utilizing that.

    I agree local DNS is faster...but IMO it'd be proper local DNS...a real DNS server. If the router is not caching DNS...then it's simply DNS forwarding...it's another step in the middle..it gets a request..turns around..asks the ISPs DNS servers that it obtains on the WAN interface...gets the request..and passes that request back to the workstation.
  7. Dsnake

    Dsnake LI Guru Member

    Even very cheap black box roter have DNS cache. I'm prety sure the RV have this.

    An no mather what everyone out there will be broke if they use the RV as they local small DNS. They should make those kind of change as an option.

    I personaly don't care cause i have AD and DNS server, but well..

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