Cisco 851W Duplex Issue
Posted on 2008-06-19
ISP = Wireless Highspeed Provider
ISP Router = Microtik
My Router = Cisco 851W
WAN = FastEthernet4
LAN = FastEthernet0-3
Server = SBS 2k3 R2 (DHCP Server)
Access Point = Cisco 1121G
LAN = 3 PCs and 2 Laptops
I installed this Cisco in place of a Linksys WRT54GS. My ISP claims that his Gateway is getting a bunch of errors pertaining to duplex mode configuration. I set the WAN on my router to half duplex mode and had Internet but my ISP was getting errors. I then set the WAN to full duplex mode which resulted in no Internet for us and no errors for the ISP. Lastly I tried to set the duplex mode to auto. We gained Internet access but the ISP started to receive errors again. What are the default settings in a Cisco 851W? Can it be a link speed issue? ANy help would be appreciated.
BTW, I'm not onsite today to test but I sure would like to get some info before I go over there.
Thanks in advance for your help.