Connecting to remote IPv6 addresses from Linux machine requires local scope id

 

Configuration details: 

 

Linux:

------

/sbin/ifconfig

eth0      Link encap:Ethernet  HWaddr 00:30:6E:38:EA:EF

          inet addr:10.212.86.40  Bcast:10.212.87.255
Mask:255.255.254.0

          inet6 addr: fe80::230:6eff:fe38:eaef/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:141195117 errors:0 dropped:0 overruns:0 frame:0

          TX packets:140958025 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:54506828681 (50.7 GiB)  TX bytes:71024803048 (66.1
GiB)

          Base address:0xa080 Memory:d0000000-d0020000

 

eth0:0    Link encap:Ethernet  HWaddr 00:30:6E:38:EA:EF

          inet addr:192.168.1.223  Bcast:192.168.1.255
Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          Base address:0xa080 Memory:d0000000-d0020000

 

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:64880485 errors:0 dropped:0 overruns:0 frame:0

          TX packets:64880485 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:352566279113 (328.3 GiB)  TX bytes:352566279113
(328.3 GiB)

 

sigfs     Link encap:IPv6-in-IPv4

          inet6 addr: fe80::c0a8:1df/128 Scope:Link

          UP POINTOPOINT RUNNING NOARP  MTU:1480  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:825 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:0 (0.0 b)  TX bytes:66116 (64.5 KiB)

 

Solaris:

--------

lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1

        inet 127.0.0.1 netmask ff000000

hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index
2

        inet 10.212.86.153 netmask fffffe00 broadcast 10.212.87.255

        ether 0:3:ba:2:cc:ee

hme0:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500
index 2

        inet 192.168.5.113 netmask ffffff00 broadcast 192.168.5.255

lo0: flags=2000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6> mtu 8252 index 1

        inet6 ::1/128

hme0: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2

        ether 0:3:ba:2:cc:ee

        inet6 fe80::203:baff:fe02:ccee/10

ip.tun0: flags=2200851<UP,POINTOPOINT,RUNNING,MULTICAST,NONUD,IPv6> mtu
1480

index 3

        inet tunnel src 192.168.5.113   tunnel dst 192.168.1.223

        inet6 fe80::c0a8:571/10 --> fe80::c0a8:1df

 

Issues that I have: 

 

I]

All outbound traffic from a Linux machine needs scope id. Why? 

Tried the following sample for Solaris-Linux combination

 

Server on Solaris

------------------

bash-2.03# ./dtserver

 

 

 

Client on Linux (With scope id)

----------------

/var/tmp/test/dc/petes

[root@sss964b1 petes]# ./dtclient  fe80::203:baff:fe02:ccee%2

Dhiren: Wed Jun 28 02:52:33 2006

 

The above client successfully connects to the Solaris server and
retrieves the time from the server.

 

Client on Linux (Without scope id)

----------------

 

[root@sss964b1 petes]# ./dtclient  fe80::203:baff:fe02:ccee

client error:: could not create connected socket socket

 

 

[II]

Linux-Linux communication on IPv6 does not work even on specifying the
scope

id. This is messy and shouldn't it work ? Please provide your comments.

 

Server on Linux

----------------

 

[root@sss964b1 petes]# pwd

/var/tmp/test/dc/petes

[root@sss964b1 petes]# ./dtserver

 

 

Client on Linux

----------------

[root@sss964b1 petes]# pwd

/var/tmp/test/dc/petes

 

./dtclient  fe80::230:6eff:fe38:eaef%2

 

The client waits in connect call whereas the server does not get any
request

and is waiting in accept call  

 

client:

--------

socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 3

connect(3, {sa_family=AF_INET6, sin6_port=htons(3333),
inet_pton(AF_INET6,

"fe80::230:6eff:fe38:eaef", &sin6_addr), sin6_flowinfo=0,

sin6_scope_id=if_nametoindex("eth0")}, 28

 

server

-------

socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 3

bind(3, {sa_family=AF_INET6, sin6_port=htons(3333), inet_pton(AF_INET6,
"::",

&sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0

listen(3, 128)                          = 0

accept(3,

 

 

[root@sss964b1 /]# netstat -a | grep 3333

tcp        0      0 *:3333                      *:*


LISTEN

tcp        0      1 ::1:36188
fe80::230:6eff:fe38:ea:3333

SYN_SENT

 

 

 

All the sample applications source code is attached: 

 

Thanks in advance. 

 

Dhiren