On Wed, 8 Jun 2016 11:31:41 +0100 Stuart Henderson <s...@spacehopper.org> wrote: > On 2016/06/08 11:59, Gerhard Roth wrote: > > On Wed, 8 Jun 2016 10:54:00 +0100 Stuart Henderson <s...@spacehopper.org> > > 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
Ah, I can reproduce that: using an arbitrary IP address here succeeds if the interface is UP but fails if it is down. > > # 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
