[Babel-users] PARTIALLY SOLVED: default route weirdness

[Dave Taht]

OK. Normally throughout the rest of my original network of 3+ years
back, I routed everything.

The new install is ethernet bridged to the wifi. Without specifying
the wired parameter for the interface, *eventually* - not on the
initial route exchange - the txcost goes up to 256, which changes the
ref_metric.

As elsewhere on the lan, things are routed, this sucks the default
route out to my old (routed) 1.7.1 instance.

in /etc/config/babeld

interface br-lan
option wired true fixes it for the new bridged boxes.

add neighbour 2390e30 address fe80::f6f2:6dff:feb6:a01c if eno1 reach
ffff ureach 0000 rxcost 96 txcost 96 rtt 2.419 rttcost 0 cost 96

add route 23922f0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
f6:f2:6d:ff:fe:b6:a0:1d metric 96 refmetric 0 via
fe80::f6f2:6dff:feb6:a01c if eno1
add route 23930d0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
f6:f2:6d:ff:fe:b6:a0:1d metric 192 refmetric 96 via
fe80::46d9:e7ff:fe93:822e if eno1
add route 2393140 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
f6:f2:6d:ff:fe:b6:a0:1d metric 192 refmetric 96 via
fe80::230:18ff:fec9:de9c if eno1

The sad thing is that I'd encountered this problem before, and normal users who
will probably default bridge their default gw ethernet and wifi
together won't see it either. Just me, with my ancient 6+ year old
network.

Now, I'm still puzzled as to why the ref_metric got wau bigger than
256 on 1.8.3. I'm a bit puzzled about the various treatments of
refmetric in the code as to a short > INFINITY and so on and what I'm
currently running is 1.7.1, bird, and a version with 1.8.3 with
refmetric universally promoted to an unsigned int. And it's lunchtime.
2 days later.

And I don't know why the 1.7.1 couch gateway is falling off entirely,
here present,

d at dancer:~/git/babeld-refmetric$ echo dump | nc ::1 33123 | grep
'prefix 0.0.0.0'
add route 23922f0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
f6:f2:6d:ff:fe:b6:a0:1d metric 96 refmetric 0 via
fe80::f6f2:6dff:feb6:a01c if eno1
add route 23930d0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
f6:f2:6d:ff:fe:b6:a0:1d metric 192 refmetric 96 via
fe80::46d9:e7ff:fe93:822e if eno1
add route 2393140 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
f6:f2:6d:ff:fe:b6:a0:1d metric 192 refmetric 96 via
fe80::230:18ff:fec9:de9c if eno1
add route 239d960 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
a2:21:b7:ff:fe:ac:e4:55 metric 416 refmetric 320 via
fe80::e091:f5ff:febe:a353 if eno1
d at dancer:~/git/babeld-refmetric$

here not:

d at dancer:~/git/babeld-refmetric$ echo dump | nc ::1 33123 | grep
'prefix 0.0.0.0'
add route 23922f0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
f6:f2:6d:ff:fe:b6:a0:1d metric 96 refmetric 0 via
fe80::f6f2:6dff:feb6:a01c if eno1
add route 23930d0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
f6:f2:6d:ff:fe:b6:a0:1d metric 192 refmetric 96 via
fe80::46d9:e7ff:fe93:822e if eno1
add route 2393140 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
f6:f2:6d:ff:fe:b6:a0:1d metric 192 refmetric 96 via
fe80::230:18ff:fec9:de9c if eno1


On Wed, Oct 3, 2018 at 7:06 AM Dave Taht <dave.taht at gmail.com> wrote:
>
> So I reverted those two boxes (couch and labgw) to 1.7.1 (they are arm
> and mips respectively). No matter in which order I restart the
> daemons, the refmetric is set properly to 0, and the metric falls to
> 256 after a couple hellos, making the lab always be the correct
> default gw.
>
> so I am assuming there is a change (bug?) in a calculation on the
> refmetric since 1.7.1. The only puzzling thing
> about this set of events is that *same exact babel configuration for
> 1.8.3 and 1.7.1* I get a metric 96 refmetric 0
> if I only have one major speaker (the labgw) and the weird refmetric
> inflation I noted on the prior email,
>
> ... and a consistent metric 256 refmetric 0... with two 1.7.1 speakers
> (watching with an 1.8.3 speaker, going to
> kill that next)
>
>  echo dump | nc ::1 33123 | grep 'prefix 0.0.0.0'
> add route 93d990 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
> f6:f2:6d:ff:fe:b6:a0:1d metric 256 refmetric 0 via
> fe80::f6f2:6dff:feb6:a01c if eno1
> add route 937f60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 352 refmetric 256 via
> fe80::230:18ff:fec9:de9c if eno1
> add route 938e60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 352 refmetric 256 via
> fe80::46d9:e7ff:fe93:822e if eno1
> add route 941a70 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> a2:21:b7:ff:fe:ac:e4:55 metric 320 refmetric 224 via
> fe80::e091:f5ff:febe
>
> I kill the couche babel
>
> d at dancer:~/git$ echo dump | nc ::1 33123 | grep 'prefix 0.0.0.0'
> add route 93d1f0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
> f6:f2:6d:ff:fe:b6:a0:1d metric 256 refmetric 0 via
> fe80::f6f2:6dff:feb6:a01c if eno1
> add route 937f60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 352 refmetric 256 via
> fe80::230:18ff:fec9:de9c if eno1
> add route 938e60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 352 refmetric 256 via
> fe80::46d9:e7ff:fe93:822e if eno1
>
> Restart the labgw - this result totally makes sense to me, for a couple hellos,
>
> d at dancer:~/git$ echo dump | nc ::1 33123 | grep 'prefix 0.0.0.0'
> add route 93d1f0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
> f6:f2:6d:ff:fe:b6:a0:1d metric 511 refmetric 0 via
> fe80::f6f2:6dff:feb6:a01c if eno1
> add route 937f60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 703 refmetric 607 via
> fe80::230:18ff:fec9:de9c if eno1
> add route 938e60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 607 refmetric 511 via
> fe80::46d9:e7ff:fe93:822e if eno1
>
> Which then evolves back to this:
>
> d at dancer:~/git$ echo dump | nc ::1 33123 | grep 'prefix 0.0.0.0'
> add route 93d1f0 prefix 0.0.0.0/0 from 0.0.0.0/0 installed yes id
> f6:f2:6d:ff:fe:b6:a0:1d metric 256 refmetric 0 via
> fe80::f6f2:6dff:feb6:a01c if eno1
> add route 937f60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 369 refmetric 273 via
> fe80::230:18ff:fec9:de9c if eno1
> add route 938e60 prefix 0.0.0.0/0 from 0.0.0.0/0 installed no id
> f6:f2:6d:ff:fe:b6:a0:1d metric 352 refmetric 256 via
> fe80::46d9:e7ff:fe93:822e if eno1



-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619