Try switching off the PC that has the IP 192.168.1.36 and see if the same log comes again. If you don't know were is this PC, you can find out the MAC address and hopefully the name of the PC like this:
[code:1]nbtstat -A 192.168.1.36 [/code:1]
This should work if the PC is not firewalled and uses Windows.
None of our machines here at the office are using PointCast. I've been doing a little research and have been advised that this might be some sort of worm. Most of the sources say the threat is very low, nevertheless its still resides on our network.
Is this related to my original issue with the 188.8.131.52 route?
I don't think so, 255.255.255.255 is a broadcast address that is used by some services like RIP advertisements or DHCP (BOOTP) broadcasts. Ports 67 and 68 are used by DHCP, your DNS server is probably also your DHCP server. Or is it not?.