Recently, my ISP disabled my internet connection. I was told because my router was sending out ?funny? traffic on their network. They could not tell me exactly what the traffic is, but they said it was my IP address broadcasting itself on their network.
Since they didn?t know what it was, I proceeded to sniff my WAN connection. I saw what I believe to be the traffic they are talking about. From what Wireshark says, it is a DHCP nak and it broadcasts itself every minute or so. I have posted a screenshot at www.pcexhaust.com/cisco.jpg
My setup is this:
Cisco 1710 (12.4 IOS) connected to my ISP. My ISP provides me with an Ethernet connection to their servers. They are running DHCP. My Cisco WAN is set to receive a DHCP address (ip address DHCP) and it does receive an address. I have turned the keep alives off (no keepalive) on my WAN interface. But, when I asked the ISP, this was not the traffic they were seeing. Besides setting the WAN to receive DHCP address and half-duplex, that is ALL that is configured on the router.
Is this DHCP nak traffic normal, or is there something wrong with either my side, or my ISP's side?