Re: [mpls-linux-general] Test IPv6 forwarding problem

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Thank you first.

--- 08/6/4 (星期三)，James R. Leu <jl...@mi...> 寫道：

> 寄件者: James R. Leu <jl...@mi...>
> 主旨: Re: [mpls-linux-general] Test IPv6 forwarding problem
> 收件者: tr...@ya...
> 副本: mpl...@li...
> 日期: 2008 6 4 星期三 上午 9:54
> Hello,
> 
> On Wed, Jun 04, 2008 at 09:46:55AM +0800,
> tr...@ya... wrote:
> > Hello there,
> > 
> > I try to add nhlfe for eth0 which using this command.
> > 
> > # mpls nhlfe add key 0 instructions push gen 1001
> nexthop eth0 ipv6 3ffe:b00:3::1
> > 
> > NHLFE entry key 0x0000003d mtu 0 propagate_ttl
> >          (0 bytes, 0 pkts)
> > 
> > 
> > Then I use "mpls nhlfe show" command to
> check the configuration. 
> > 
> > # mpls nhlfe show
> > 
> > NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
> >         push gen 1001 set eth0 ipv6 3ffe:b00:3::  (0
> bytes, 0 pkts)
> > 
> > 
> > but, the ipv6 address of nexthop is incorrect.
> > Please let me know if I am missing any step or any
> thing is incorrect.
> 
> I've had people attempt to map IPv6 onto a LSP, but I
> do not recall
> anyone trying to build the LSP with IPv6 nexthop addresses,
> so I think
> your in uncharted territory.
> 
> I'm surprised it got as far as it did.  I'm
> wondering if there is just
> a display error in the 'mpls' code.  I'm a
> total noob when it comes to
> IPv6.  If you can provide a quick set of steps I can use to
> reproduce
> this I will try to fix it.
> 

My testbed is as follows:

(pc 2)------(LER 2)--------(LER 1)--------(pc 1)
　eth0　　eth1　eth0　　　eth0　eth1　　eth0

PC 1
------
ifconfig eth0 inet6 add 3ffe:b00:1::1/48

LER 1
------
ifconfig eth0 inet6 add 3ffe:b00:3::1/48
ifconfig eth1 inet6 add 3ffe:b00:1::2/48
echo "1" >/proc/sys/net/ipv6/conf/all/forwarding
mpls nhlfe add key 0 instructions push gen 1001 nexthop eth0 ipv6 3ffe:b00:3::2
(returns key 0x3d)
ip route add 3ffe:b00:6::/48 via 3ffe:b00:3::2 mpls 0x3d

mpls labelspace set dev eth0 labelspace 0
mpls ilm add label gen 2001 labelspace 0

LER 2
------
ifconfig eth0 inet6 add 3ffe:b00:3::2/48
ifconfig eth1 inet6 add 3ffe:b00:6::2/48
echo "1" >/proc/sys/net/ipv6/conf/all/forwarding
mpls nhlfe add key 0 instructions push gen 2001 nexthop eth0 ipv6 3ffe:b00:3::1
(returns key 0x3)
ip route add 3ffe:b00:1::/48 via 3ffe:b00:3::1 mpls 0x3

mpls labelspace set dev eth0 labelspace 0
mpls ilm add label gen 1001 labelspace 0

PC 2
------
ifconfig eth0 inet6 add 3ffe:b00:6::1/48

Test LER 1
------
Try again and look the nexthop of nhlfe after each command.

# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3::  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3::  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3::  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:8b02:0:38a1:3408  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:8b02:0:38a1:3408  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:fb11:d08:fb11:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:fb11:d08:fb11:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:fb11:d08:fb11:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:fb11:d08:fb11:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:c310:d08:da10:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:c310:d08:da10:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:fb11:d08:fb11:d08  (0 bytes, 0 pkts)
# mpls nhlfe show
NHLFE entry key 0x0000003d mtu 1496 propagate_ttl
        push gen 1001 set eth0 ipv6 3ffe:b00:3:0:fb11:d08:fb11:d08  (0 bytes, 0 pkts)

I had tried "IPv4 over MPLS: two LER example for mpls-linux-1.95x", but I really don't understand what's the IPv6 problem.

Thank you very much

> > 
> > Thanks & Regards.
> > 
> > 
> >      
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> 
> -- 
> James R. Leu
> jl...@mi...

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