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Date:	Sun, 08 Jun 2008 22:03:39 +0200
From:	Deti Fliegl <deti AT fliegl DOT de>
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To:	cygwin AT cygwin DOT com
Subject:	XP + cygwin version 1.7: problem with /proc/net/if_inet6 format and if_indextoname
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Hi,

according to http://tldp.org/HOWTO/Linux+IPv6-HOWTO/proc-net.html the 
format of /proc/net/if_inet6 contains scope and interface flags in 
position 4 and 5.

In Windows XP it looks like this (excerpt):
fe80000000000000020b5dfffea4902b 08 40 08 01 
{8C302852-0093-4ED1-8BBD-BAEA630C3A2A}
fe8000000000000002ffa4fffe224702 06 40 06 01 
{A4224702-1783-4CE5-B0BE-E02885C29AA1}
fe80000000000000020000fffe000001 05 40 05 04 
{2C2F83B8-BEF7-4B7B-AED6-E87A8B4252D2}
fe80000000000000020b5dfffe96a55c 04 40 04 01 
{AB80DBF9-46A7-463C-933C-5CD48E9B583E}
fe8000000000000000005efec0a80266 02 40 02 04 
{48FCE3FC-EC30-E50E-F1A7-71172AEEE3AE}
00000000000000000000000000000001 01 80 00 04 
{6BD113CC-5EC2-7638-B953-0B889DA72014}

In Windows Vista it looks like this (full):
20014c50fffe000589223b7d1c32bf30 08 40 00 04 
{92F7E3A1-A7C4-4D89-A80F-C62EF31CE0DE}
20014c50fffe00058c77167371f63d08 08 80 00 04 
{92F7E3A1-A7C4-4D89-A80F-C62EF31CE0DE}
fe8000000000000089223b7d1c32bf30 08 40 08 04 
{92F7E3A1-A7C4-4D89-A80F-C62EF31CE0DE}
00000000000000000000000000000001 01 80 00 04 
{3D4E88D4-6A70-11DB-B1BA-806E6F6E6963}
fe8000000000000000000100007ffffe 0A 40 0A 03 
{B3B050EF-8A68-4ECC-8FEB-7E6C0EDB93F2}

As you can see in XP the interface index (netlink device number) in 
position 2 is equal to the scope value in position 4.
Vista shows different values for index and scope - this seems to be correct.

My question: Did I hit a bug? Is there any documentation what's the 
meaning of the values for scope and interface flags (they don't seem to 
follow the referenced definitions of the Linux kernel).

Further it seems that if_indextoname(...) does not work for XP while it 
  works for Vista. Don't know if this problem is related. Did I miss 
something? I would appreciate any hint.

Deti


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