It seemed I was getting close to a solution on this issue, so I'm posting this
again in the hope that someone will know what's going wrong.
This IPv6 ping doesn't work, and it's causing a lengthy freeze in the tomcat
start-up (see bottom).
This is on Debian Etch linux 2.6.20 - can anyone tell me what controls the
config for IPv6 here?
Thanks
Adam
Adam Hardy on 23/05/08 15:47, wrote:
No, on the box that doesn't work, I get this:
[EMAIL PROTECTED]:~$ sudo ping6 ::1
Password:
PING ::1(::1) 56 data bytes
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
--- ::1 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3000ms
I tried using sudo because of the 'Operation not permitted' message -
thought it might be a user permissions thing - but apparently not.
Jim Cox on 23/05/08 15:08, wrote:
Admittedly grasping at straws here, but does an IPv6 ping to localhost
work
the same on both boxes, e.g.:
[EMAIL PROTECTED]:~$ ping6 ::1
PING ::1(::1) 56 data bytes
64 bytes from ::1: icmp_seq=1 ttl=64 time=0.047 ms
64 bytes from ::1: icmp_seq=2 ttl=64 time=0.039 ms
--- ::1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
?
On Thu, May 22, 2008 at 12:29 PM, Adam Hardy
<[EMAIL PROTECTED]>
wrote:
Tell you the truth, I can only assume IPv6 stuff is configured to the
debian etch defaults - although that might have changed between the
date I
installed the no-pause-box and the date I installed the problem box.
no-pause-box:
eth0 Link encap:Ethernet HWaddr 00:10:DC:79:FF:8F
inet addr:192.168.0.234 Bcast:192.168.0.255
Mask:255.255.255.0
inet6 addr: fe80::210:dcff:fe79:ff8f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:606692 errors:0 dropped:0 overruns:0 frame:0
TX packets:598681 errors:0 dropped:0 overruns:0 carrier:0
collisions:65 txqueuelen:1000
RX bytes:145074456 (138.3 MiB) TX bytes:44751878 (42.6 MiB)
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:59645 errors:0 dropped:0 overruns:0 frame:0
TX packets:59645 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5125125 (4.8 MiB) TX bytes:5125125 (4.8 MiB)
box-with-pause (eth1 is LAN, eth2 is internet):
eth1 Link encap:Ethernet HWaddr 00:18:F3:98:F4:EC
inet addr:192.168.0.2 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::218:f3ff:fe98:f4ec/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:134101 errors:0 dropped:0 overruns:0 frame:0
TX packets:138909 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:12595060 (12.0 MiB) TX bytes:53461584 (50.9 MiB)
Base address:0xbc00 Memory:fe8e0000-fe900000
eth2 Link encap:Ethernet HWaddr 00:08:54:0A:B1:E7
inet addr:86.138.125.132 Bcast:86.138.125.132 Mask:
255.255.255.255
inet6 addr: fe80::208:54ff:fe0a:b1e7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:56889 errors:0 dropped:0 overruns:0 frame:0
TX packets:50695 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:42379708 (40.4 MiB) TX bytes:6543279 (6.2 MiB)
Interrupt:58 Base address:0xd800
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:3894 errors:0 dropped:0 overruns:0 frame:0
TX packets:3894 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:236606 (231.0 KiB) TX bytes:236606 (231.0 KiB)
Jim Cox on 22/05/08 14:05, wrote:
I'm assuming the pause you saw was at the following line?
connect(11, {sa_family=AF_INET6, sin6_port=htons(48669),
inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
28) = -1 ETIMEDOUT (Connection timed out)
That looks like a connect attempt to the IPv6 loopback address (?)
which
times out, but the corresponding line from the "no-pause" box seems
to do
the same without delay. Do you have IPv6 enabled on both boxes, i.e.
does
the output from "/sbin/ifconfig -a" look similar?
On Thu, May 22, 2008 at 8:52 AM, Adam Hardy
<[EMAIL PROTECTED]>
wrote:
I think this is the equivalent part of the strace log from another
machine
on the LAN:
socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 10
listen(10, 1) = 0
getsockname(10, {sa_family=AF_INET6, sin6_port=htons(54792),
inet_pton(AF_INET6, "::", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
[28]) = 0
socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET6, sin6_port=htons(54792),
inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
28) = 0
fcntl64(10, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(10, F_SETFL, O_RDWR|O_NONBLOCK) = 0
accept(10, {sa_family=AF_INET6, sin6_port=htons(51175),
inet_pton(AF_INET6,
"::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 12
shutdown(11, 2 /* send and receive */) = 0
Jim Cox on 22/05/08 13:38, wrote:
Can you compare that output to a capture from the box where you don't
see
the pause? I wonder if it's a difference in IPv4/IPv6 configuration
between
the boxes...
On Thu, May 22, 2008 at 8:24 AM, Adam Hardy <
[EMAIL PROTECTED]>
wrote:
Found it! But I think my knowledge of linux system calls and kernel
functions is letting me down now. Presumably that is port 48669,
which
should be open - but is it a DNS call? If it is a DNS call, then the
DNS
server on the same machine should serve it - piping it out to the
net,
presumably. But with my DNS server running, which up to now has
worked
fine,
and with the gateway open to allow internet access, tomcat still
freezes.
So I guess it doesn't matter what the DNS call is for, the
problem is
that
my DNS server is not serving it? I guess that means its config needs
tweaking to tell it to serve DNS requests on the loopback interface.
socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 10
listen(10, 1) = 0
getsockname(10, {sa_family=AF_INET6, sin6_port=htons(48669),
inet_pton(AF_INET6, "::", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
[28]) = 0
socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET6, sin6_port=htons(48669),
inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0},
28) = -1 ETIMEDOUT (Connection timed out)
close(10) = 0
close(11) = 0
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