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WRT54G "Internet Port"

Discussion in 'Cisco/Linksys Wireless Routers' started by mdrandall, Sep 30, 2005.

  1. mdrandall

    mdrandall Network Guru Member

    My system currently has a SAMR-4110 ADSL 1-Port router ( acting as DHCP and internet gateway. It is connected to one of the LAN ports on a WRT54G ( and this acts as a router to the other PCs.

    I would like to operate the SAMR-4110 as a basic ADSL modem and us ethe WRT54G as firewall/DHCP etc. However, if I turn off the DHCP in the SAMR-4110 and turn it on in thw WRT, I cannot get internet access. The PCs list the WRT as the gateway and DNS server.

    I have tried connecting the SAMR-4110 to the WRT "Internet Port" but then I cannot even get to the setup screen. Can somebody please explain the difference between the 4 LAN ports and the single Internet port?

    Any thoughts on how I can configure the WRT to do all the work and just use the SAMR-4110 as a modem?

  2. Esquire

    Esquire Mesquire Staff Member Member

    The Internet or WAN port on a broadband modem is for connecting to a broadband modem, e.g., cable modem, DSL/ADSL modem, etc.

    Not familiar with SAMR-4110 but how is it usually connected to the Internet? Does it have its own PPPoE dialler? If this is CPE (Customer Premise Equipment) provided by your ISP you may have to call them and ask them to exchange it for a modem instead.
  3. crawdaddy

    crawdaddy Network Guru Member

    it's down and dirty, but have you thought to connect the DSL modem/router to the internet port, and set the linksys router to use DHCP? another thought is that my Westell modem is also a router, however if u hold the reset button in for 10 seconds when you first plug it in, and only have it plugged into the WAN port of the router when you do so, it will act only as a modem in "bridged" mode. Hope this helps
  4. LoneRanger

    LoneRanger Network Guru Member

    Firstly I assume you can access the internet by connecting directly to the SAMR-4110 and hence the ISP username & password are all in order. ie verify the modem is working first to eliminate this as a potential problem.

    Next I see you have placed the SAMR4110 & WRT54G in the same subnet. The SAMR4110 has address & the WRT54G This will not work. Unless you have a specific preference reset the SAMR4110 back to its default address of with subnet mask of An alternative would be with subnet mask of . Leave the DHCP server active on the SAMR4110

    On the WRT, set the "Internet Connection Type" to "Automatic Configuration DHCP". You can leave the "Router IP" address as , but again it may be easier to reset it to the default of . The ISP details go into the SAMR modem-router and not the WRT. Leave the DHCP server active on the WRT54G

    Now run an RJ45 cable between the SAMR4110 & WRT54G Internet port. Plus another between your PC & one of the LAN ports on the back of the WRT. Naturally you could also access the WRT via a wireless connection if desired.

    Hopefully that should be all that is required to get the two boxes communicating. You should be able to access the WRT54G via & the SAMR4110 via
  5. mdrandall

    mdrandall Network Guru Member

    Thanks for the info. The setup I described above seems to work but only if I plug the SAMR cable into a LAN port on the WRT. Then I can access it's setup page etc.

    However, if I move the cable to the WRT Internet port, I cannot get access via or The LED on the front of the WRT illuminates.

    Is there any setup required to enable the Internet port?

    Thanks for your patience.
  6. LoneRanger

    LoneRanger Network Guru Member

    Have you checked that the SAMR & WRT are in different subnets?

    For example
    SAMR-4110 mask
    WRT54G mask

    And the DHCP servers are enabled on both devices?.

    The WRT54G needs to obtain a TCPIP address for its internet port from the SAMR.

    using the above, a pc connected to the WRT54G would obtain say address & the WRT54G would obtain for its internet port.

    I neglected to mention in my first reply; have you set your pc to automatically obtain a TCPIP address or is it a static definition?

    I am not aware of any setup to enable the internet port.

    If everything else fails, factory reset both the SAMR & WRT. Their out of the box state should allow a connection prior to any customisation. You can then change the relevant passwords, SSSID, ISP username/password, etc. But only do that as a last resort
  7. mdrandall

    mdrandall Network Guru Member

    Well I have made some progress but not quite there yet!

    The SAMR-4110 is set to in bridge mode with the correct user name and password etc. It's DHCP is enabled.

    The WRT54G is set to in Automatic DHCP mode also with it's DHCP enabled.

    With the SAMR-4110 connected to the WRT54G internet port, I can access the local network (IP in the range 192.168.100 onwards) and also access the SAMR-4110 at

    The SAMR reports a good ADSL connection, however any attempts to access the internet gets a 504 page error.

    The PC network connection status shows the following:

    IP Address
    Default Gateway
    DHCP Server
    DNS Server

    I tried forcing the DNS Server to an ISP one ( and also tried forcing the gateway to

    I tried to ping a network address (again but this returned an error.

    I also tried setting the WRT54G to PPPoE mode but then could not access the SAMR-4110 at

    Any ideas what I may be doing wrong?

    Thanks very much for all your help
  8. mdrandall

    mdrandall Network Guru Member

    Oh and the WRT54G reports as its internet port address.
  9. LoneRanger

    LoneRanger Network Guru Member

    I had a brief test earlier this evening when I reset my SAMR-4110 and WRT54G back to their factory state. Then apart from entering my ISP username & password on the SAMR I made no other configuration changes to either box. I could then happily connect to the WRT54G at , the SAMR-4110 at and the internet without problem.

    Naturally I have now changed the configuration on both boxes to something more secure.

    I can also see you've been looking in the ADSLTECH forum and they recommended half-bridge mode. This presents the ISP IP address to the WRT54G rather than an address from the SAMR DHCP pool, i.e. the SAMR is acting as a pure ADSL modem rather than a modem/router.

    Given you have tried this as well without success, I suspect it may be a problem on your pc. Are your running Norton?, I have heard this can cause some strange conflicts.

    Plus I'm not sure if you have connected your pc directly to the SAMR-4110 either via the USB or RJ45 port (LAN port highly recommended if your pc has one) to ensure you can access the internet via this route.

    And I doubt if it makes any difference but my WRT54G is running the latest tofu5 build based on the Linksys 4.20.7 base with Hyperwrt extensions and previously was ok with the original Hyperwrt 2.1b1
  10. mdrandall

    mdrandall Network Guru Member

    Thanks for the info again. I hope to have another try tomorrow and will follow your configuration exactly.

    I have not tried the half bridge idea but will also try that as well. Any thoughts on which method is better?

    Yes I do have Norton but only for Antivirus. The software firewall is Zonealarm Pro.

    The WRT54G is running HyperWRT 2.1b1 (v3.03.6).

    You mentioned that you have now reset your system to something more secure. Can you give me a brief run through on what you recommend?

    Thanks again.
  11. LoneRanger

    LoneRanger Network Guru Member

    To tighten up the security.

    (a) Change the WRT54G password from "Admin"

    (b) Choose a wireless SSID other than "Linksys" - I have two neighbours using "Default" and another has stuck with "Linksys". Use something completely random with no association to your name, house, etc. It is a waste of time turning off SSID broadcast

    (c) Hopefully your wireless cards support WPA-PSK with AES. Use a long key made up of random letters & numbers. A step down in security is WPA with TKIP. If your are forced onto WEP specify the password as 26 hex digits. Avoid any word or combinations found in a dictionary.

    (d) If really keen add MAC address filters

    The intent is to deter the curious from acessing your network, a few sensible measures will ensure they move to an unprotected access point down the road.

    And you never know with Norton AV, it does some strange things. I use AVG so cannot really comment if there are any special measures required.

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