On 2016/06/08 11:59, Gerhard Roth wrote:
> On Wed, 8 Jun 2016 10:54:00 +0100 Stuart Henderson <[email protected]>
> wrote:
> > On 2016/06/08 11:48, Gerhard Roth wrote:
> > >
> > > Currently I do this to get the interface up and running as my default
> > > route:
> > >
> > > # ifconfig umb0 pin xxxx apn xxxx
> > > # ifconfig umb0 inet 0.0.0.1 0.0.0.2
> > > # route delete default
> > > # route add -ifp umb0 default 0.0.0.2
> > > # ifconfig umb0 up
> > >
> > > Yes it seem strange that the 'route add -ifp ubm0' needs an IP address,
> > > but that's the way it is. That's why I need the fake IP address on
> > > the interface right from the beginning. Otherwise the 'route add'
> > > would fail.
> >
> > Ah yes this is a known strangeness - the address in the "route add"
> > can be anything at all though, it doesn't need to be configured on
> > the interface.
>
> Well, to me it looks as if we need to put it on the interface:
>
> # route add -ifp umb0 default 0.0.0.2
> route: writing to routing socket: Network is unreachable
> add net default: gateway 0.0.0.2: Network is unreachable
> # ifconfig ubm0 inet 0.0.0.1 0.0.0.2
> # route add -ifp umb0 default 0.0.0.2
> add net default: gateway 0.0.0.2
>
hmm... I wonder if that check in route addition can be relaxed,
at least for the case where the -ifp interface is point-to-point.
I think you'll find that you *can* use an address other than
the one configured on the interface though.
$ ifconfig pppoe1
pppoe1: flags=48851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST,INET6_NOPRIVACY>
mtu 1500 llprio 3
index 18 priority 0
dev: em1 state: session
sid: 0x1378 PADI retries: 1 PADR retries: 0 time: 1d 12:05:38
sppp: phase network authproto chap
groups: pppoe zen egress
status: active
inet6 fe80::20d:b9ff:fe41:7e48%pppoe1 -> prefixlen 64 scopeid 0x12
inet6 2a02:8011:d00e:3:225:90ff:fec0:77b5 -> prefixlen 64
inet 82.68.199.142 --> 62.3.84.27 netmask 0xffffffff
# route delete default # make sure it's cleared:
route: writing to routing socket: No such process
delete net default: not in table
# route add default -ifp pppoe1 1.2.3.4
add net default: gateway 1.2.3.4
# route -n get 8.8.8.8
route to: 8.8.8.8
destination: default
mask: default
gateway: 1.2.3.4
interface: pppoe1
if address: 82.68.199.142
priority: 8 (static)
flags: <UP,GATEWAY,DONE,STATIC>
use mtu expire
430 0 0
# ping -c1 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=58 time=14.027 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 14.027/14.027/14.027/0.000 ms
