I found it. If the ip I set is a linklocal ip (fe80) , then
s6_adr16[1] will change to ifp->if_index.
if (sa6 && sa6->sin6_family == AF_INET6) {
if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
if (sa6->sin6_addr.s6_addr16[1] == 0) {
/* link ID is not embedded by the user */
sa6->sin6_addr.s6_addr16[1] =
htons(ifp->if_index);
} else if (sa6->sin6_addr.s6_addr16[1] !=
htons(ifp->if_index)) {
return(EINVAL); /* link ID contradicts */
}
So I set another IP (3ffe .....) ,and it works OK.
2012/12/24 cyl cyl <cyle...@gmail.com>:
> Hello:
>
> In function init_net_IPv6, I set "fe80::219:dbff:fea9:f3d5"
> for my eth0 ipv6 address. But _show_all_interfaces says my ip is
> "fe80:1::219:dbff:fea9:f3d5". I don't know why it adds a "1" in it.
> The prefix I set is "fe80:0:0:0" .
>
>
> ipv6: fe80::219:dbff:fea9:f3d5, in6mask64: ff ff ff ff ff ff ff ff
>
> 0xa0b53204 - eth0 - 192.168.1.239
> 0xa0b53220 - eth0 - fe80:1::200:ff:fe6c:18f0
> 0xa0b5323c - eth0 - fe80:1::219:dbff:fea9:f3d5
> 0xa0b53274 - lo0 - ::1
> 0xa0b53290 can_send: 1
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