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Old 07-23-2013, 10:22 PM   #1
jzoudavy
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Registered: Apr 2012
Distribution: Ubuntu, SUSE, Redhat
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link local ipv6 question


hey guys

so consider a hypothetical question.

on one side of the ethernet cable is a custom build linux blade cluster, and one of the blades has an interface called eth0 and it has an ipv4 and ipv6 address.

on the other side of the ethernet cable is a quagga router with its interface called eth1, with ipv4 and ipv6 address.

the eth 0 and 1 are under a 192.168.1.0/30 subnet and pingable to each other.

the two ipv6 addresses in question are link local address so fe80...bla...bla.

now, on the blade cluster side, i have defined the ipv6 subnet as fe80::/64. which should cover just about everybody. but, when i try to ping, i get nothing.

quagga tells me i have invalid arguments
LinuxRouter# ping6 fe80::20c:29ff:fea9:bef2 --> this is eth1, quagga's own ipv6 link local
connect: Invalid argument

and the blade cluster just shows this
> ping6 fe80::20c:29ff:fe67:f588 --> this is eth0, by the way, blade cluster's own ipv6 link local
UDP connect

and when i try to get them to ping each other, I still only see UDP connect. nothing else.

can someone help me and point out whether
a) what i am doing should be possible?
b) if not, why not?

thanks guys
 
Old 07-24-2013, 04:56 AM   #2
serafean
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Hi, Link local addresses are only that : specific to the link.
Any address in the fe80:: prefix is automatically assigned to an interface and used for negotiating an actual address (Neighbour discovery etc). Routers will not forward any address of this type. The scope of link local addresses is the actual physical link.
When pinging a link local address, you have to specify which interface to ping it from because there are no routes for these adresses
Code:
LinuxRouter# ping6 fe80::20c:29ff:fea9:bef2%eth0
assuming eth0 is the interface from which you want the ping packet to go out.

I hope this is at least a bit clear.

Serafean

Just an FYI : the equivalent of your 192.168.1/30 subnet in IPv6 is called a Unique Local Address and is in the fd00:: prefix.
 
Old 07-25-2013, 11:42 AM   #3
jzoudavy
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hi serafean,

thanks for the clarification, you are right, if i include -i ping works.

davy
 
  


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