Crossover Cable shouldn't matter as all MT routerboards are auto MD/X. Most cable companies have the MAC authorized on their systems, and a call to their support to rest the MAC should fix your problem. If you see any ethernet errors, try 100M/full on the port without auto negotiate.
Mike On Sat, Apr 2, 2011 at 4:55 PM, Greg Ihnen <[email protected]> wrote: > I posted this on the MT forum but I wanted to throw it out here too. > Thanks. > > I've got an RB-750 that I want to replace with an RB-750G and I can't get > any connectivity between the RB-750G and the Motorola Surfboard cable modem. > > First I exported in imported the RB-750's config into the RB-750G but the > RB-750G didn't seem to be getting a DHCP address from the Motorola Surfboard > cable modem on it's Ether1-Gateway port. I had a link light but no > connectivity, the RB-750G wouldn't even respond to a ping from the internet. > Then I tried the RB-750G with the default config (after \system reset) and > it still wouldn't work. Again I had a link light but no connectivity in or > out. Next I disabled the RB-750G's DHCP client on the Ether1-Gateway port > and manually configured it for the public IP address that the Surfboard has > been giving out via DCHP for years. It's a dynamic IP address but it never > changes even after widespread system wide outages experienced by the cable > company. That seems to be our address. Anyway, Even with the IP address > manually configured I still couldn't get any connectivity. > > I'm located in South America and the modem/RB-750G in question are in NY. > I'm managing all this remotely. When I was testing connectivity I was trying > to ping the router from the internet, connect to the router via WinBox from > the internet, and by having the local users attempt to access the internet. > All of those failed. > > Now my guess is the RB-750G and modem are not successfully auto-negotiating > the Ethernet port parameters. So I had the user pick up a cross over cable > which I'm going to try next with the RB-750G set to 100Mbps and full duplex. > > Any ideas about what the problem could be would be greatly appreciated. > > Greg > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > > -------------------------------------------------------------------------------- > > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ >
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