[CUWiN-Dev] Rev. 4085 disappearing default routes

[tom]

I put a build of rev. 4085 made by Dan Blah on the downtown Urbana network 
today. There's some funkiness with the routing that I don't understand.

Some of the time nodes seem to lose their default routes:

# route get default
route: writing to routing socket: not in table

This seems to happen at random to all the nodes, I can't figure out why 
they'll occasionally just lose them and then, a few minutes later, have 
figured it out again.

Even when the default route is correct, however, there seems to be other 
problems that prevent any traffic from successfully navigating the network 
(pinging out, say).

As an example, the node at 115 W. Main St. correctly thinks it's default 
route is 169.254.230.110, the IMC. However, it routes traffic to the IMC 
through the library, which is a pretty poor decision. It might think it's a 
better link, though, and would be forgiven if that actually worked, but 
traffic doesn't ever make it to the IMC's node ("no route to host").

Below is a routing table for the 115 W Main node when the default route is 
missing (I would include a more useful example of when it isn't missing, but 
it's been gone for a while now that I actually need it... if it comes back, 
I'll send it along).

# netstat -r
Routing tables

Internet:
Destination        Gateway            Flags    Refs      Use    Mtu 
Interface
10.0/16            localhost          UGRS    33192   lo0
10.177.40/24       169.254.237.68     UG1         -   ath0
10.177.40.254      169.254.237.68     UGH1        -   ath0
10.177.80/24       link#2             UC          -   sip0
127/8              localhost          UGRS    33192   lo0
localhost          localhost          UH      33192   lo0
169.254/16         link#1             UC          -   ath0
169.254.177.226    169.254.237.68     UGH1        -   ath0
169.254.230.110    169.254.237.68     UGH1        -   ath0
169.254.237.68     00:02:6f:20:ed:44  UHLc        -   ath0
224.0.0.5          localhost          UGH1    33192   lo0
224.0.0.6          localhost          UGH1    33192   lo0
224.0.0.9          localhost          UGH1    33192   lo0

Internet6:
Destination        Gateway            Flags    Refs      Use    Mtu 
Interface
::/104             localhost          UGRS        -   lo0
::/96              localhost          UGRS        -   lo0
localhost          localhost          UH      33192   lo0
::127.0.0.0/104    localhost          UGRS        -   lo0
::224.0.0.0/100    localhost          UGRS        -   lo0
::255.0.0.0/104    localhost          UGRS        -   lo0
::ffff:0.0.0.0/96  localhost          UGRS        -   lo0
2001:db8::/32      localhost          UGRS        -   lo0
2002::/24          localhost          UGRS        -   lo0
2002:7f00::/24     localhost          UGRS        -   lo0
2002:e000::/20     localhost          UGRS        -   lo0
2002:ff00::/24     localhost          UGRS        -   lo0
fc00::/7           localhost          UGRS        -   lo0
fdb4:542d:dc11:77: fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:39f fe80::202:6fff:fe2 UG1         -   ath0
fdb4:542d:dc11:39f fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:b0c fe80::202:6fff:fe2 UG1         -   ath0
fdb4:542d:dc11:b0c fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:b0e fe80::202:6fff:fe2 UG1         -   ath0
fdb4:542d:dc11:b0e fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:b11 fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:b12 fe80::202:6fff:fe2 UG1         -   ath0
fdb4:542d:dc11:b12 fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:b15 link#2             UC          -   sip0
fdb4:542d:dc11:b15 00:00:24:c2:b1:50  UHL         -   lo0
fdb4:542d:dc11:b23 fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:ba1 fe80::202:6fff:fe2 UG1         -   ath0
fdb4:542d:dc11:ba1 fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:ec2 fe80::202:6fff:fe2 UGH1        -   ath0
fdb4:542d:dc11:ec2 fe80::202:6fff:fe2 UGH1        -   ath0
fe80::/10          localhost          UGRS        -   lo0
fe80::%ath0/64     link#1             UC          -   ath0
fe80::202:6fff:fe2 fe80::202:6fff:fe2 UGH1        -   ath0
fe80::202:6fff:fe2 fe80::202:6fff:fe2 UGH1        -   ath0
fe80::202:6fff:fe2 00:02:6f:20:ed:46  UHL         -   lo0
fe80::202:6fff:fe2 fe80::202:6fff:fe2 UGH1        -   ath0
fe80::%sip0/64     link#2             UC          -   sip0
fe80::200:24ff:fec 00:00:24:c2:b1:50  UHL         -   lo0
fe80::%lo0/64      fe80::1%lo0        U           -   lo0
fe80::1%lo0        link#3             UHL         -   lo0
fe80::230:95ff:fef fe80::202:6fff:fe2 UGH1        -   ath0
ff01:1::/32        link#1             UC          -   ath0
ff01:2::/32        link#2             UC          -   sip0
ff01:3::/32        localhost          UC          -   lo0
ff02::%ath0/32     link#1             UC          -   ath0
ff02::%sip0/32     link#2             UC          -   sip0
ff02::%lo0/32      localhost          UC          -   lo0


HSLS is running, all the nodes can ping each other just fine, there's plenty 
of HSLS traffic and linkstate info. So I'm a little stumped, especially 
because nothing of this sort was happening with revision 4074 (0.7.0rc1). 
Did something change that might cause this? Thanks for any input...

Tom