I have 2x cisco routers connected back to back with an ethernet connection to my cable modem. The router connected to my cable modem is configured with irb and setup as a transparent IPS. The second router is configured with the new cbac zone based firewall which then connects to my Private network.
The setup works fine for a number of days then I find I cannot connect to the internet. When I look at the router connected to my LAN it has no ip address. With debugging I can see the DHCP requests but I am getting no replies. If I plug my cable modem directly into my first router (bypassing the irb router) it gets an address no problem. I can then reconnect the irb router and it works fine again for a period of time.
When its in the failed state I see the arp table on the irb router shows my public IP address as incomplete and debugging on my first router shows no UDP packets recieved yet I see plenty on the IRB router.
Does anyone know what the problem is or how I can look at the mac addresses in the UDP packets? Is there any other tables I should be looking at?
i think you cannot seeing udp, but you can see a lot of tcp. Not to say that this is unusual. This tcp traffic seems to be occurring on network .Looks like a UDP packet get sent to the Ciscoworks server on port 16236. But what should it contain? After re-initializing UT table yesterday, only 1 username populates out of thousands of entries (MAC addresses).
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...