https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c Jiaying ren changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jren@suse.com AssignedTo|bnc-team-screening@forge.pr |mt@suse.com |ovo.novell.com | -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c2 --- Comment #2 from andreas bittner 2012-11-27 11:44:46 UTC --- I actually tried to fiddle around with dhcpcd a bit, and -d and --test and also -M with -M set at commandline on eth0, the whole eth0 interface stays at the mtu of 1500 and Internet connection seems to run more happily? Still this whole thing is weird, as experimenting with a connected windowsXP machine to this opensuse linux router with the windows machine running some ping -f (dont defrag) tests, seems to hint that packets of 1472bytes seem to go through, adding the 28bytes header gives us 1500bytes total which is the default maximum ethernet packet size, thus demonstrating that this cableinternet is working fine with mtu set at 1500. So now the real question is why is the opensuse networking stack and components set the mtu via dhcp to 576 on this cableinternet setup. Who is to be blamed with the trouble, is it the cableinternet provider sending some weird replies in their dhcp packets, but then again the windowsvista machine worked fine or maybe simply didnt care for mtu stuff and uses mtu of 1500 as default or constant on all wired ethernet interfaces? whatever. I am no real lowlevel expert of any of this. If opensuse could sort this out in some properly documented or standard adhering ways, would be best and probably would help other opensuse users and the community as well, or maybe I can even give some feedback at the cableinternet provider but only if we can debug this issue really extensively and collect and assamble all the facts and standards that are involved so that this issue can be handled properly. Thanks and regards. -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c4 Marius Tomaschewski changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED --- Comment #4 from Marius Tomaschewski 2012-11-30 16:27:42 UTC --- OK, thanks! OK, I'm going to apply the - $(( $new_interface_mtu )) -lt 576 ] ; + $(( $new_interface_mtu )) -le 576 ] ; fix to include 576 in the invalid range. We are so kind to ask for the MTU and the ISP dhcp server (or your cable modem?) reports some crap lower than this. Please start: ip link set up dev eth0 # just to make sure it is up wireshark -k -i eth0 -f 'udp port 67 or udp port 68' -w dhcp.cap & then execute: dhcpcd-test eth0 when dhcpcd-test is done, attach the "dhcp.cap". To avoid that clients asks for, edit /etc/dhclient.conf and remove the "interface-mtu" from request. For dhcpcd, edit /etc/sysconfig/network/dhcp and set the -M option: DHCPCD_USER_OPTIONS='-M'. Further, you may set your mtu as needed in the ifcfg file -- when default (1500) does not work for unfragmented packets. -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c6 --- Comment #6 from Marius Tomaschewski 2012-11-30 16:41:34 UTC --- (In reply to comment #3)

Question now is, how can an Interface be kept at 1500MTU if its wired ethernet via yast2 or some config files the best ways without being too hacky.

You can use "yast2 sysconfig" to set -M in /etc/sysconfig/network/dhcp. -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c10 --- Comment #10 from Marius Tomaschewski 2012-12-04 08:42:33 UTC --- (In reply to comment #9)

I already had that minimal request line in the config file last week, and that didnt help. I now have additionally the -M parameter in the other config file in sysconfig directory, that helps

Sure... sysconfig can use two different dhcp clients: dhcpcd: default client, needs DHCPCD_USER_OPTIONS='-M' parameter dhclient: ISC client from "dhcp-client" package, makes use of the /etc/dhclient.conf file. The dhclient is used only, when you change the DHCLIENT_BIN to "dhclient" in /etc/sysconfig/network/dhcp. Otherwise dhcpcd.

so should I then contact this ISP and tell them about their misbehaviour or something? Is somebody disrespecting any RFCs or standards or anything?

No, I don't see anything would break some RFCs... The server reports what the administrator configured. It is expected, the admin provides an MTU, which is suitable for the connection, ... This low and inconsistent mtu (I guess, your gateway isn't using 576) causes a lot of "Path MTU Discovery" resends and when some firewall blocks the ICMP notifications on the path, ... You can try to report it to the ISP as it disrupts you and lowers the througput; I which you luck! But I don't think they will change this... -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c Swamp Workflow Management changed: What |Removed |Added ---------------------------------------------------------------------------- Status Whiteboard|maint:running:50349:low |. -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c15 --- Comment #15 from Bernhard Wiedemann 2013-01-31 13:00:36 CET --- This is an autogenerated message for OBS integration: This bug (791280) was mentioned in https://build.opensuse.org/request/show/150556 Maintenance / https://build.opensuse.org/request/show/150558 Maintenance / -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c17 Swamp Workflow Management changed: What |Removed |Added ---------------------------------------------------------------------------- Status Whiteboard|maint:running:50349:low |maint:running:50349:low | |maint:released:sle11-sp2:50 | |573 --- Comment #17 from Swamp Workflow Management 2013-02-19 19:10:44 UTC --- Update released for: dhcp, dhcp-client, dhcp-debuginfo, dhcp-debugsource, dhcp-devel, dhcp-relay, dhcp-server Products: SLE-DEBUGINFO 11-SP2 (i386, ia64, ppc64, s390x, x86_64) SLE-DESKTOP 11-SP2 (i386, x86_64) SLE-SDK 11-SP2 (i386, ia64, ppc64, s390x, x86_64) SLE-SERVER 11-SP2 (i386, ia64, ppc64, s390x, x86_64) SLES4VMWARE 11-SP2 (i386, x86_64) -- 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.

https://bugzilla.novell.com/show_bug.cgi?id=791280 https://bugzilla.novell.com/show_bug.cgi?id=791280#c18 --- Comment #18 from Swamp Workflow Management 2013-04-04 16:05:51 UTC --- openSUSE-SU-2013:0625-1: An update that solves one vulnerability and has 6 fixes is now available. Category: security (moderate) Bug References: 783002,784640,788787,791280,791289,794578,811934 CVE References: CVE-2013-2266 Sources used: openSUSE 11.4 (src): dhcp-4.2.4.P2-0.34.1 -- 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.