On Thu, Jun 02, 2011 at 06:00:44PM +0200, Björn Persson wrote: > Daniel P. Berrange wrote: > > On Thu, Jun 02, 2011 at 04:40:10PM +0100, Richard W.M. Jones wrote: > > > The Linux machines on my LAN appear to have acquired IPv6 addresses, eg: > > > > > > $ ip addr show eth0 > > > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast > > > state UNKNOWN qlen 1000 > > > > > > link/ether 00:e0:81:74:02:28 brd ff:ff:ff:ff:ff:ff > > > inet 192.168.0.128/24 brd 192.168.0.255 scope global eth0 > > > inet6 fe80::2e0:81ff:fe74:228/64 scope link > > > > > > valid_lft forever preferred_lft forever > > > > > > but pinging them gives me strange errors: > > > > > > $ ping6 fe80::2e0:81ff:fe74:228/64 > > > unknown host > > > $ ping6 fe80::2e0:81ff:fe74:228 > > > connect: Invalid argument > > > $ ping6 fe80::2e0:81ff:fe74 > > > connect: Invalid argument > > > > Anything with an fe80:: prefix is a link local address, which > > is only unique within the scope of a single LAN segment. Thus > > if you want to send traffic to such addresses, you need to specify > > the NIC to send the traffic out from. The vast majority of apps > > using sockets have no way to let you do this. > > Ping6 has a way though: > > $ ping6 -I eth0 fe80::200:24ff:fec9:2e0c > PING fe80::200:24ff:fec9:2e0c(fe80::200:24ff:fec9:2e0c) from > fe80::21e:8cff:fecf:cde5 eth0: 56 data bytes > 64 bytes from fe80::200:24ff:fec9:2e0c: icmp_seq=1 ttl=64 time=1.69 ms > 64 bytes from fe80::200:24ff:fec9:2e0c: icmp_seq=2 ttl=64 time=0.263 ms But that's not so useful if no other programs can use these addresses. Is there a way to assign "proper" addresses? Just run radvd and configure it with a random prefix? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
