Very Computer

I am writing a program that tests the health of a NIC card. I am
creating a NDD socket (Data Link Access) which I will use to send ICMP
ECHO packets to a given host. This means that my application has to
build the entire packet and I have to create and add the IP/IPv6,
ICMP/
6, and MAC headers in my application. I got things to work for IP, but
I am stuck with IPv6:

1) How do I find the MAC address for an IPv6 remote host? For IP, I
use the SIOCGARP ioctl and get the MAC adress from the ARP cache. But
IPv6 does not use ARP. there is something called neighbor discovery
for IPv6, but I could not find any programatic interface to use it ..

2) How do I do a broadcast ping in IPv6? In v4, I just put the
broadcast address in the destination addr fiend of the IP header and
things worked, but what do I do for v6?

Thanks in advance for your help.

Jigs

Quote:

> Thanks in advance for your help.

> Jigs

--
Hans

OK, it doesn't say must!

bash-3.1# ip addr -6 show dev eth0
2: eth0: <BROADCAST,MULTICAST,NOTRAILERS,UP,10000> mtu 1500 qdisc
pfifo_fast qlen 1000
     link/ether 00:11:43:61:8d:db brd ff:ff:ff:ff:ff:ff
     inet6 2001:888:1639::4/48 scope global
        valid_lft forever preferred_lft forever
     inet6 fe80::211:43ff:fe61:8ddb/64 scope link
        valid_lft forever preferred_lft forever
bash-3.1#

The global scope is mac-free, but the scope link is not. And on another
pc of mine every bridge-port (except eth3) seems to have its own ip6
addr whether i like it or not:

bash-3.1# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.003018a54f01       no              eth0
                                                         eth1
                                                         eth2
                                                         eth3
bash-3.1# ip -6 addr show
1: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000
     inet6 fe80::230:18ff:fea5:ebfd/64 scope link
        valid_lft forever preferred_lft forever
2: lo: <LOOPBACK,UP,10000> mtu 16436
     inet6 ::1/128 scope host
        valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000
     inet6 fe80::230:18ff:fea5:4f01/64 scope link
        valid_lft forever preferred_lft forever
4: eth2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qlen 1000
     inet6 fe80::230:18ff:fea5:4f02/64 scope link
        valid_lft forever preferred_lft forever
7: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500
     inet6 2001:888:1639::2/48 scope global
        valid_lft forever preferred_lft forever
     inet6 fe80::230:18ff:fea5:4f01/64 scope link
        valid_lft forever preferred_lft forever

--
Hans