[Bug 228039] New: IP V6 - causing connection delays - cannot be switched off
https://bugzilla.novell.com/show_bug.cgi?id=228039 Summary: IP V6 - causing connection delays - cannot be switched off Product: SUSE Linux 10.1 Version: Final Platform: Other OS/Version: Other Status: NEW Severity: Major Priority: P5 - None Component: Network AssignedTo: bnc-team-screening@forge.provo.novell.com ReportedBy: towo@computer.org QAContact: qa@suse.de I have delays of 12-18 seconds when opening a TCP connection. It is caused by a DSL router which drops IP V6 packets ignorantly (rather than handling or rejecting them) and by the timeout applied before the system retries with IP V4. This is confirmed by the "disableIPv6" option that firefox offers locally; setting it to true fixes the problem for web access but not for any access outside firefox (command line ftp/ssh etc). So how can IP V6 be disabled completely in the system? This is with SUSE 10.1, in contrast to the same effect described in bug #200180 which suggests that it can be disabled by yast in 10.2. (Also I think it's different from bug #147656 and bug #147075 which describe missing IP V6 functionality if I understand them right.) I found advice on the Internet (also referred to in bug #200180) to manipulate one of /etc/modules.conf or /etc/modprobe.conf (depending on SUSE release) and set either: alias net-pf-10 off or: alias net-pf-10 ipv6 install ipv6 /bin/true Nothing works. I also tried in /etc/sysconfig/SuSEfirewall2: FW_IPv6_REJECT_OUTGOING="yes" Nothing works. Since this interworking problem is not too exotic (there are other reports, in other network situations too, including with external servers), I consider this a major bug. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 mhorvath@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO Info Provider| |towo@computer.org ------- Comment #1 from mhorvath@novell.com 2006-12-13 03:08 MST ------- Have you tried this howto: http://en.opensuse.org/SDB:Disabling_IPv6_completely ? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 towo@computer.org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |ASSIGNED Info Provider|towo@computer.org | ------- Comment #2 from towo@computer.org 2006-12-14 16:21 MST ------- No, I hadn't but it does not help either. I made all 3 modifications, rebooted and delays with ftp/telnet/ssh are still 20 seconds. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 chrubis@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |NEEDINFO Info Provider| |towo@computer.org ------- Comment #3 from chrubis@novell.com 2006-12-19 09:30 MST ------- Please try to do this: 1) run ifconfig ( as root ) it should print some info about your interfaces. 2) on interface witch you want to disable ipv6 for example eth0 you should to look for line with inet6 addr: xxxx::xxxx:xxxx:xxxx:xxxx/xx 3) to diable ipv6 run ifconfig eth0 del xxxx::xxxx:xxxx:xxxx:xxxx/xx this should disable ipv6 address on this interface. Additionally you can attach output from ifconfig here. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 towo@computer.org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |ASSIGNED Info Provider|towo@computer.org | ------- Comment #4 from towo@computer.org 2006-12-19 18:01 MST ------- There is no such line in the output of ifconfig. I have, however, the following additional output which looks interesting: root[de_DE.UTF-8]@localhost:~> time traceroute6 google.com google.com: Der Name oder der Dienst ist nicht bekannt real 0m20.005s user 0m0.000s sys 0m0.004s root[de_DE.UTF-8]@localhost:~> time traceroute -m 1 google.com traceroute to google.com (64.233.187.99), 1 hops max, 40 byte packets 1 opencom31 (192.168.69.254) 2.297 ms 2.542 ms 3.610 ms real 0m20.029s user 0m0.004s sys 0m0.004s root[de_DE.UTF-8]@localhost:~> time traceroute -4 -m 1 google.com traceroute to google.com (64.233.187.99), 1 hops max, 40 byte packets 1 opencom31 (192.168.69.254) 3.043 ms 2.942 ms 2.827 ms real 0m0.033s user 0m0.000s sys 0m0.004s -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 chrubis@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|bnc-team- |kernel-maintainers@forge.provo.novell.com |screening@forge.provo.novell| |.com | Status|ASSIGNED |NEW -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 ------- Comment #5 from towo@computer.org 2007-01-04 18:09 MST ------- I found some explanations of the problem: http://www.frameip.com/nntp/article-linux-debian-maint-ipv6.php?numero=1683 http://www.ubuntuforums.org/archive/index.php/t-77686.html http://atm.tut.fi/list-archive/nanog/msg37148.html but no solution. I can image a solution with a local nameserver that handles the issue, rejecting IPv6 requests and forwarding IPv4 requests to the external nameserver. Any advice how to install such a device on SUSE Linux? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 ------- Comment #6 from towo@computer.org 2007-01-10 01:53 MST ------- I found that the explanations quoted in comment #5 can easily be confirmed: - telnet google.com 80 has the delay (20s) - ping google.com gives the IP address - telnet 72.14.207.99 80 (google.com IP address) works properly, no delay Also, the problem can be avoided by making an entry to /etc/hosts. So, following some hints from the information quoted in comment #5, it is most probably a glibc bug, might also be a kernel problem, though. Please add glibc component/maintainers to the listeners of this bug report, and please get if fixed... Also, obviously a local DNS server gateway could easily fix the issue as a workaround, but it is far from obvious how to install such a thing. Please also give some advice here (as a means of bug resolution). -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 ------- Comment #7 from towo@computer.org 2007-01-10 01:55 MST ------- Created an attachment (id=112154) --> (https://bugzilla.novell.com/attachment.cgi?id=112154&action=view) script to add IP address entry to /etc/hosts As I noted in comment #6, the bug can be avoided for specific hosts by making an entry to /etc/hosts. The attached script makes this entry for convenience. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=228039 gregkh@novell.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |WONTFIX ------- Comment #8 from gregkh@novell.com 2007-01-11 18:22 MST ------- Does this still happen on the 10.2 release? If so, please reopen the bug. If not, please note that we don't support the 10.1 release any more except for security issues. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
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