Unspecified IPv6 Address

2008-01-23 Thread Prabhu Hariharan 
Hi,

Why certain hosts of freebsd can be configurable with unspecified (::)
(all-zero) IPv6 addresses in its interfaces?  RFC 4291 clearly mentions
this address must never be assigned to any node.  Is there is any use-case
or motivation behind accepting this address in an interface?

Regards,
Prabhu H
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IPv6 address persistent configuration thru ifconfig

2008-01-22 Thread Prabhu Hariharan 
Hi,

In host implementation, if I manually configure global ipv6 address via
ifconfig command then those addresses are not persistent after making the
interface DOWN and again UP, which is not the case for IPv4 addresses.  Is
this an intentional behavior that all ipv6 address needs to be removed from
interface if it goes DOWN?  I feel the configurations that have been made
manually, needs to get unconfigured manually and not programatically.

Regards,
Prabhu H
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Re: IPv6 address persistent configuration thru ifconfig

2008-01-22 Thread Prabhu Hariharan 
Is this behavior exists from the beginning of KAME integration or available
in latest freebsd code?  Because I was using a box which derives its ipv6
code from KAME project and the behavior was different from this.  Also, in a
host which uses Red Hat Enterprise Linux AS release 4 (Nahant Update 4),
I've seen the ipv6 addresses get removed when I do an interface down.
Please let me know, if you have any thoughts on the same.

Regards,
Prabhu H

On Jan 22, 2008 6:08 PM, Wojciech Puchar [EMAIL PROTECTED]
wrote:

  In host implementation, if I manually configure global ipv6 address via
  ifconfig command then those addresses are not persistent after making
 the
  interface DOWN and again UP, which is not the case for IPv4 addresses.
  Is
  this an intentional behavior that all ipv6 address needs to be removed
 from
  interface if it goes DOWN?  I feel the configurations that have been
 made

 nothing gets removed
 [EMAIL PROTECTED] ~]# ifconfig fxp0
 fxp0: flags=8843UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST mtu 1500
 options=8VLAN_MTU
 inet6 fe80::2d0:59ff:febe:fadc%fxp0 prefixlen 64 scopeid 0x1
 inet 10.255.245.1 netmask 0xff00 broadcast 10.255.245.255
 inet6 2001:4070:101:2::1 prefixlen 64
 ether 00:d0:59:be:fa:dc
 media: Ethernet autoselect (none)
 status: no carrier
 [EMAIL PROTECTED] ~]# ifconfig fxp0 down
 [EMAIL PROTECTED] ~]# ifconfig fxp0
 fxp0: flags=8802BROADCAST,SIMPLEX,MULTICAST mtu 1500
 options=8VLAN_MTU
 inet6 fe80::2d0:59ff:febe:fadc%fxp0 prefixlen 64 scopeid 0x1
 inet 10.255.245.1 netmask 0xff00 broadcast 10.255.245.255
 inet6 2001:4070:101:2::1 prefixlen 64
 ether 00:d0:59:be:fa:dc
 media: Ethernet autoselect (none)
 status: no carrier
 [EMAIL PROTECTED] ~]# ifconfig fxp0 up
 [EMAIL PROTECTED] ~]# ifconfig fxp0
 fxp0: flags=8843UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST mtu 1500
 options=8VLAN_MTU
 inet6 fe80::2d0:59ff:febe:fadc%fxp0 prefixlen 64 scopeid 0x1
 inet 10.255.245.1 netmask 0xff00 broadcast 10.255.245.255
 inet6 2001:4070:101:2::1 prefixlen 64
 ether 00:d0:59:be:fa:dc
 media: Ethernet autoselect (none)
 status: no carrier


  manually, needs to get unconfigured manually and not programatically.
 
  Regards,
  Prabhu H
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