ISIS v6 Default Route

Question

I have 3 hosts A, B and C. A connects to B and B connects to C. A and C have no direct connection. A and C have a default route for BGP and ISIS (done with default originate command fo ISIS). A and C have local firewalls with A being primary. They are all IBGP neighbors. I need to raise default route metric of ISIS so C will use its BGP route instead.
v4 IGP is OSPF which i just mark up with a route map, I don't see similar options for ISIS.

Answer 1

My local network is 192.168.139.0/24 and my gateway is 192.168.139.1
Not according to that netstat output.
Nowhere does 192.168.139 appear anywhere in the list. In fact, that's telling me that 169.254.x.x is the subnet attached to your ethernet port.
That typically happens because your machine didn't get a response from the DHCP server. This could be due to a flaky DHCP server (e.g. its unreliable, slow, or otherwise not responding), or because your DHCP server has run out of addresses to issue to clients.
It could also be caused by poor cabling between you and the DHCP server.
Either way it sounds like your DHCP lease isn't getting renewed, and that's where I'd focus.