(usagi-users 02678) Command can not receive response to own ipv6 linklocal address

[Hiroaki Kago <kago@xxxxxxxxxxxxxx>]

Hello,

I executed ftp and telnet command to own ipv6 linklocal address for the
interface eth0, but I could not receive their response. I used kernel,
ftp, ftpd, telnet and telnetd of usagi snap shot linux24-s20031013.

The result of the ftp command on IPv6 was as follows, and ftp was time out.

---------------------------------------------------------------------
[root]$ /usr/bin/ftp fe80::230:5ff:fe4a:4fc3%eth0
ftp: connect: Connection timed out
ftp> by
[root]$
---------------------------------------------------------------------

I supervised eth0 and lo using 'tcpdump' at the time of ftp execution,
and I found that the packets were transmitted from lo, and received
by lo.

The result of supervised eth0
---------------------------------------------------------------------
[root]$ tcpdump -v -e -n -i eth0 ip6
tcpdump: listening on eth0

0 packets received by filter
0 packets dropped by kernel
[root]$
---------------------------------------------------------------------

The result of supervised lo
---------------------------------------------------------------------
[root]$ tcpdump -v -e -n -i lo ip6
tcpdump: listening on lo
19:27:45.579557 0:0:0:0:0:0 0:0:0:0:0:0 ip6 94: ::1.32798 >
fe80::230:5ff:fe4a:4fc3.ftp: S [tcp sum ok] 2012622026:2012622026(0) win
32752 <mss 16376,sackOK,timestamp 989256 0,nop,wscale 0> (len 40, hlim 64)
19:27:45.579579 0:0:0:0:0:0 0:0:0:0:0:0 ip6 94:
fe80::230:5ff:fe4a:4fc3.ftp > ::1.32798: S [tcp sum ok]
2004983229:2004983229(0) ack 2012622027 win 32728 <mss
16376,sackOK,timestamp 989256 989256,nop,wscale 0> (len 40, hlim 64)
19:27:45.579583 0:0:0:0:0:0 0:0:0:0:0:0 ip6 74: ::1.32798 >
fe80::230:5ff:fe4a:4fc3.ftp: R [tcp sum ok] 2012622027:2012622027(0) win
0 (len 20, hlim 64)
19:27:48.579116 0:0:0:0:0:0 0:0:0:0:0:0 ip6 94: ::1.32798 >
fe80::230:5ff:fe4a:4fc3.ftp: S [tcp sum ok] 2012622026:2012622026(0) win
32752 <mss 16376,sackOK,timestamp 989556 0,nop,wscale 0> (len 40, hlim 64)
19:27:48.579130 0:0:0:0:0:0 0:0:0:0:0:0 ip6 94:
fe80::230:5ff:fe4a:4fc3.ftp > ::1.32798: S [tcp sum ok]
2007982779:2007982779(0) ack 2012622027 win 32728 <mss
16376,sackOK,timestamp 989556 989556,nop,wscale 0> (len 40, hlim 64)
19:27:48.579134 0:0:0:0:0:0 0:0:0:0:0:0 ip6 74: ::1.32798 >
fe80::230:5ff:fe4a:4fc3.ftp: R [tcp sum ok] 2012622027:2012622027(0) win
0 (len 20, hlim 64)
:
:


36 packets received by filter
0 packets dropped by kernel
[root]$
---------------------------------------------------------------------

The telnet command was the same result.

I think it is the cause that the kernel transmits and receives packets
by the loopback interface lo, in spite of specifying eth0.
Is this a problem of kernel?

Regards,
Hiroaki Kago