wrv200 ports

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by johnu, Jan 29, 2008.

  1. johnu

    johnu LI Guru Member

    I cannot turn off dhcp at the router or else I cannot access the internet, so I have given dhcp a range of to to play with. Then I assigned my various MAC addresses a static IP address.

    Port 1 > VLAN 1
    Port 2 > VLAN 2
    Port 3 and 4 are open.

    I have a domain controller that is a DHCP server, so I am going to plug that into Port 3... or maybe I should plug a hub into Port 3 and then the server and client machines into that.

    If I do this, can I have the domain controller on port 3 act as a DHCP server for the machines on that network, and then keep machines on VLAN 1 and VLAN 2 using static IPs?

    It's my understanding that WRV200 is suppoed to give 50 static IPs (according to the docs) but I can add only 20 via the web UI.
  2. Sfor

    Sfor Network Guru Member

    Well. The statis IP function in the WRV200 is still a form of DHCP server. So, it is not a static IP, after all. It works by assining a proper IP to a computer with known MAC.

    If you want a truely static IP you shoud to set it in every computer separately.

    You should not use the WRV200 dhcp server along with other DHCP server. So, if you want to use the domain controller to do the DHCP, you should disable the WRV200 DHCP, I believe. In such a case it will be necesary for the domain controller DHCP server to use the WRV200 LAN IP address as the gateway. Also, you are using VLAN. So, the WLAN devices will have to have the access to the domain controller, and the domain controller will have to provide valid DNS server IP's through its DHCP.
  3. DocLarge

    DocLarge Super Moderator Staff Member Member

    Two DHCP servers will wreak havoc on your network, so setting the either the wrv200 "or" the domain controller is what you should do (personally, I'd make the domain controller your DHCP server). Additionally, the gateway device (as hinted by SFOR) will be the wrv200.

  4. johnu

    johnu LI Guru Member

    Well - if I turn off DHCP on the router, Post 1 (vlan1) and Port 2 (vlan 2) will not be able to access the internet.

    So if I leave the DHCP on the router on, and then plugin a hub to port 3 (with a static IP address) and connect the network machines to the hub - they will get their IP address from the DC right, and not the router?
  5. Sfor

    Sfor Network Guru Member

    If the computers in both VLAN 1 and VLAN 2 do have the DHCP turned on they will loose the TCP/IP communication possibility with Internet access included. But, it will be enough to set a proper static IP settings for them to work without the DHCP server and to be able to access the Internet.

    Wrong. There will be a conflict between WRV200 DHCP server and DC. Besides, the computers with the static IP will not be able to get any settings from any DHCP server, as the DHCP is off in a computer with a static IP set.
  6. HughR

    HughR LI Guru Member

    I'm sure that you are right in this case.

    Pedantic mode: the DHCP protocol is designed so that multiple DHCP servers can coexist. If a client gets multiple offers, it makes the choice of which to accept.
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