A problem in ndp and rtadvd.

Dear all:
I use command, date, to set current time. I find this causes the two
problems. I test the following two cases in freebsd 5.5-STABLE and
in freebsd 7.0-BETA2, and I find the result is the same.

1.in neighbor discovery protocol(ndp)
The following is my command sequence.

$ ndp -a
Neighbor Linklayer Address Netif Expire S Flags
2001:b121:4::cccc 0:50:8d:48:57:9a fxp0 permanent R
2001:b121:4:0:41f7:42ee:d08c:ca8c 0:90:cc:c2:aa:61 fxp0 26s R
9999:9999::1 0:5:1c:15:a:8b rl0 permanent R
fe80::205:1cff:fe15:a8b%rl0 0:5:1c:15:a:8b rl0 permanent R
fe80::250:8dff:fe48:579a%fxp0 0:50:8d:48:57:9a fxp0 permanent R
fe80::290:ccff:fec2:aa61%fxp0 0:90:cc:c2:aa:61 fxp0 30s R
fe80::1%lo0 (incomplete) lo0 permanent R

$ date
Fri Mar 21 16:14:18 UTC 2008

$ sudo date 0703211614
Password:
Wed Mar 21 16:14:00 UTC 2007

$ ndp -a
Neighbor Linklayer Address Netif Expire S Flags
2001:b121:4::cccc 0:50:8d:48:57:9a fxp0 permanent R
2001:b121:4:0:41f7:42ee:d08c:ca8c 0:90:cc:c2:aa:61 fxp0 366d0h0m4 R
9999:9999::1 0:5:1c:15:a:8b rl0 permanent R
fe80::205:1cff:fe15:a8b%rl0 0:5:1c:15:a:8b rl0 permanent R
fe80::250:8dff:fe48:579a%fxp0 0:50:8d:48:57:9a fxp0 permanent R
fe80::290:ccff:fec2:aa61%fxp0 0:90:cc:c2:aa:61 fxp0 366d0h0m4 R
fe80::1%lo0 (incomplete) lo0 permanent R
===============================================================================================

I adjust system current time to one year ago by using 'date' command. we can find
ndp expiration time, in Expire column, also extended one year. Is this OK?

2.in router advertisement daemon(rtadvd)
I also adjust system current time to test rtadvd. Before I adjust system
current time, rtadvd can send unsolicited RA periodically. rtadvd can send
unsolicited RA about from 200 seconds to 600 seconds each time. But after I
adjust system current time to one year ago, rtadvd does not send unsolicited
RA any more. Is the behavior correct?

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