[Bug 1185884] Re: TCP traffic stalls
[Expired for openconnect (Ubuntu) because there has been no activity for 60 days.] ** Changed in: openconnect (Ubuntu) Status: Incomplete = Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
Andreas, any new information on this bug? Any feedback from lkml (link to thread?) or any more results with other kernel versions? ** Changed in: openconnect (Ubuntu) Status: New = Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
Yes. The issue is still there in openconnect 5.01 as shipping with 13.10. Is seems to boil down to the fact that that openconnect does not seem to honor X-DTLS-MTU. My current workaround is to force the base-mtu value. Meanwhile i posted the issue to the openconnect mailing list as well. Have a look at http://lists.infradead.org/pipermail/openconnect- devel/2013-October/001246.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
The issue is somehow related to the file size. Sending 100k exposes the problem for me, sending 1k works. I've just sent a report to lkml as it at least varies with the kernel. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
Local tcpdump of working scp local - remote (kernel 3.5.0-27, openconnect 4.07) ** Attachment added: local dump of working scp local - remote https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+attachment/3691146/+files/tcpdump-nostall-client-3.5.0-27.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
Remote tcpdump of stalling scp local - remote (local kernel 3.8.0-23, openconnect 4.07) ** Attachment added: remote dump of stalling scp local - remote https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+attachment/3691145/+files/tcpdump-stall-remote.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
In your dump, it seems that the first full-sized packet you send is going missing. The normal reason for this is a misconfigured firewall, where some idiot has decided to drop ICMP packets without understanding what they're for. Then you send a packet which is too large to fit through some upstream link, the router sends back an ICMP needs fragmentation response, and the broken firewall drops it. So you just keep assuming your packet was dropped, and resending it. However, you shouldn't need to send a 10M file for that; you should only really need to send a file which is a few kilobytes. Does the problem still happen then? If you reduce the MTU on your vpn interface (tun0 or vpn0) to various lower values, does that make it better? Or if you echo 1 /proc/sys/net/ipv4/ip_no_pmtu_disc ? Are you able to run tcpdump on any host the *other* side of the VPN link from you? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1185884] Re: TCP traffic stalls
Hm, just noticed the fact that this behaviour varies from kernel to kernel; sorry. I'm assuming the dump you showed was from the problematic kernel? Can you show one from the working kernel? Just the start of the connection with the first large packets and the acks to them, not the whole thing. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1185884 Title: TCP traffic stalls To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openconnect/+bug/1185884/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
