Re: [Dnsmasq-discuss] [Fwd: Re: Long freeze during tomcat start]
Adam Hardy on 23/05/08 14:23, wrote: I'm trying to figure out a time-out issue with the Apache Tomcat web server, and I have dug quite deeply into the issue with the help of the tomcat user mailing list. Apparently my machine's configuration for IPv6 may be causing a connection time-out and failure during tomcat's start-up routine. The machine is a gateway between the internet and my LAN, running dnsmasq as a DHCP and DNS server. To add some more info, IPv6 ping6 doesn't work. This is on Debian Etch linux 2.6.20 - can anyone tell me what controls the config for IPv6 here? adam@isengard:~$ 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 I also found this while searching: http://storybridge.org/wordpress/2007/06/20/dnsmasq-does-not-like-ipv6/ which sounds useful but I'm not sure why it would work or where it should go.
Re: [Dnsmasq-discuss] [Fwd: Re: Long freeze during tomcat start]
Gilles Espinasse on 23/05/08 15:26, wrote: Selon Adam Hardy adam@cyberspaceroad.com: I'm trying to figure out a time-out issue with the Apache Tomcat web server, and I have dug quite deeply into the issue with the help of the tomcat user mailing list. ... I don't have any plans to set up my LAN as an IPv6 network, and I can't find any tomcat configuration options to tell it not to use IPv6 - have you got any tips that I could follow to sort this one out? Thanks Adam You could disable IPv6 on various distrib using receipts based on not loading ipv6 module (google will show some answer, I was not able to retrieve the page with the various receipt) With ipv6 disabled, tomcat should not try to use it ;-) Hi, thanks for the response. Before I take the route of disabling IPv6, ideally I would rather try to configure IPv6 properly (assuming this is the issue). As I said in the original email (not in the copied email above) tomcat only demonstrates this problem on the one machine with the gateway and dnsmasq running. The workstation on the LAN doesn't suffer this issue. I figure it is something to do with the way I configured it. Regards Adam
[Dnsmasq-discuss] [Fwd: Re: Long freeze during tomcat start]
I'm trying to figure out a time-out issue with the Apache Tomcat web server, and
I have dug quite deeply into the issue with the help of the tomcat user mailing
list.
Apparently my machine's configuration for IPv6 may be causing a connection
time-out and failure during tomcat's start-up routine. The machine is a gateway
between the internet and my LAN, running dnsmasq as a DHCP and DNS server.
Tomcat displays a freeze or hang at start-up which I have tracked down to an
IPv6 system call that times out, as shown by this line from a tomcat strace log:
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)
Tomcat runs fine on a workstation on my LAN. This is my ifconfig -a output from
the two machines:
Good machine:
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)
loLink 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)
Gateway machine (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:fe8e-fe90
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
loLink 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)
I don't have any plans to set up my LAN as an IPv6 network, and I can't find any
tomcat configuration options to tell it not to use IPv6 - have you got any tips
that I could follow to sort this one out?
Thanks
Adam
Re: [Dnsmasq-discuss] [Fwd: Re: Long freeze during tomcat start]
Selon Adam Hardy adam@cyberspaceroad.com: I'm trying to figure out a time-out issue with the Apache Tomcat web server, and I have dug quite deeply into the issue with the help of the tomcat user mailing list. ... I don't have any plans to set up my LAN as an IPv6 network, and I can't find any tomcat configuration options to tell it not to use IPv6 - have you got any tips that I could follow to sort this one out? Thanks Adam You could disable IPv6 on various distrib using receipts based on not loading ipv6 module (google will show some answer, I was not able to retrieve the page with the various receipt) With ipv6 disabled, tomcat should not try to use it ;-) Gilles
