Recently, it became easy to connect two or more ISP. Because of spread of the Internet.
It means increaseing case that we can use multi-homed platform. Multi-homeing is useful
for redundancy, plicy routing and road balancing. I think multi-homing
is suitable to Network Architecture of Continues Mobility. By this test, the problem
of multi-homing became clear.
Dyna1 has two default router. Because Power2 and Power3 advertise Router Advertisement(RA).
These perfix is same. It is "2001:200:0:8411::/64". Power1, Power2 and Power3 run OSPF.
At first Dyna1 do "ping6" command to "gr2000.k2c.wide.ad.jp". And I take the log of
routing table at each PC. After that I do interface rtk0 or wm0 of router down.
I watch the behavior of KAME.
When interface down near Dyna1 at Power3 | When interface down near Power1 at Power3 |
I look Power2 and Power3 as ISPs.
ISP configure Reverse Path Filtering by securty purpos.
Power2 pass the packet that source address or destination address
is generated from 2001:200:0:8410::/64.
Power3 pass the packet that source address or destination address
is generated from 2001:200:0:8411::/64.
Among Power2, Power3 and gr2000 run RIPng.
And amoung Power1, Power2 and Power3 run OSPF.
Power1 send two kind of RA, and there is two network prefix.
Therefore Dyna1 have two IP addresses.
Dyna1 do "ping6" command to "gr2000.k2c.wide.ad.jp". And I take the log of
routing table at each PC. After that I do interface rtk0 of Power1 down.
I watch the behavior of KAME.
Dyna1 has two default router and two global addresses. Power2 send RA its prefix is "2001:200:0:8412::/64". Power3 send RA its prefix is "2001:200:0:8411::/64". Dyna1 have address generated by "2001:200:0:8411::/64" and address generated by "2001:200:0::8412::/64".
Power1, Power2 and Power3 run OSPF.
At first Dyna1 do "ping6" command to "gr2000.k2c.wide.ad.jp". And I take the log of
routing table at each PC. After that I do interface rtk0 or wm0 of router down.
I watch the behavior of KAME.
When interface down near Dyna1 at Power3 | When interface down near Power1 at Power3 |