[Bug 793646] New: dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

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10 Dec 2012 10 Dec '12

12:34

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c0 Summary: dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address Classification: openSUSE Product: openSUSE 12.2 Version: Final Platform: x86-64 OS/Version: openSUSE 12.2 Status: NEW Severity: Normal Priority: P5 - None Component: Network AssignedTo: bnc-team-screening@forge.provo.novell.com ReportedBy: Scott.Simpson@computer.org QAContact: qa-bugs@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11 Through YaST you can select NetworkManager or ifup/ifdown for configuring your network. If you select ifup/ifdown, dhcpcd is used for IPv4 and dhclient is used for IPv6. If you select NetworkManager, then dhclient is used for both IPv4 and IPv6. There is a bug in dhcpcd where it sets the MTU too small (576) when setting IPv4 and then IPv6 can't get a DHCP address. See the discussion at http://lists.opensuse.org/opensuse/2012-12/msg00142.html which explains the problem. Reproducible: Always Steps to Reproduce: See forum posting. If I kill dhclient6, then manually set the MTU to 1500, then restart dhclient6 it gets the address correctly. -- 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.

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bugzilla_noreply＠novell.com

10 Dec 10 Dec

14:21

New subject: [Bug 793646] dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c1 Cristian Rodríguez changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |crrodriguez@opensuse.org Component|Network |Kernel AssignedTo|bnc-team-screening@forge.pr |kernel-maintainers@forge.pr |ovo.novell.com |ovo.novell.com --- Comment #1 from Cristian Rodríguez 2012-12-10 11:21:38 CLST --- The very first thing to be checked is why the kernel is allowing an MTU of 576 to be set on the link, even though the standard and the networking code clearly defines a minimum --> include/uapi/linux/ipv6.h #define IPV6_MIN_MTU 1280 -- 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.

bugzilla_noreply＠novell.com

15 Jul 15 Jul

20:57

New subject: [Bug 793646] dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c Jeff Mahoney changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|kernel-maintainers@forge.pr |jbohac@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.

bugzilla_noreply＠novell.com

6 Aug 6 Aug

21:57

New subject: [Bug 793646] dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c2 Jiri Bohac changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO InfoProvider| |Scott.Simpson@computer.org --- Comment #2 from Jiri Bohac 2013-08-06 23:57:21 CEST --- (In reply to comment #0)

...

Through YaST you can select NetworkManager or ifup/ifdown for configuring your network. If you select ifup/ifdown, dhcpcd is used for IPv4 and dhclient is used for IPv6. If you select NetworkManager, then dhclient is used for both IPv4 and IPv6. There is a bug in dhcpcd where it sets the MTU too small (576) when setting IPv4 and then IPv6 can't get a DHCP address.

Are you sure this value is not passed in the DHCP reply by the server? Please provide the contents of /var/lib/dhcpcd/dhcpcd-eth0.info (In reply to comment #1)

...

The very first thing to be checked is why the kernel is allowing an MTU of 576 to be set on the link, even though the standard and the networking code clearly defines a minimum

--> include/uapi/linux/ipv6.h #define IPV6_MIN_MTU 1280

That's how the kernel is designed to work. If you set the MTU below 1280, it turns off IPv6 on that interface. -- 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.

bugzilla_noreply＠novell.com

19 Aug 19 Aug

16:04

New subject: [Bug 793646] dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c3 --- Comment #3 from Scott Simpson 2013-08-19 16:04:10 UTC --- Hmm. I've switched to NetworkManager. I have the following processes running: root 1338 0.0 0.0 14316 1220 ? S Aug03 0:06 /sbin/dhclient -d -4 -sf /usr/lib/nm-dhcp-client.action -pf /var/run/dhclient-eth1.pid -lf /var/lib/dhcp/dhclient-a022ad05-ca4c-4ef1-a8a8-cfc251c20028-eth1.lease -cf /var/run/nm-dhclient-eth1.conf eth1 root 1565 0.0 0.0 10080 1180 ? S Aug03 0:00 /sbin/dhclient -d -6 -N -sf /usr/lib/nm-dhcp-client.action -pf /var/run/dhclient6-eth1.pid -lf /var/lib/dhcp/dhclient6-a022ad05-ca4c-4ef1-a8a8-cfc251c20028-eth1.lease eth1 dhcpd 3983 0.1 0.1 41132 6740 ? Ss Aug17 3:03 /usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0 The contents of /var/lib/dhcp/dhclient6-a022ad05-ca4c-4ef1-a8a8-cfc251c20028-eth1.lease are (external interface is eth1): lease6 { interface "eth1"; ia-na 02:11:c2:04 { starts 1376917385; renew 172800; rebind 276480; iaaddr 2001:558:6045:47:8ddb:8e79:dbc5:e49c { starts 1376917385; preferred-life 345600; max-life 345600; } } option dhcp6.client-id 0:1:0:1:18:6f:6b:f3:64:70:2:11:c2:4; option dhcp6.server-id 0:1:0:1:15:d6:8a:53:14:fe:b5:cf:db:5f; } If I do an "ifconfig eth1" I get: eth1 Link encap:Ethernet HWaddr 64:70:02:11:C2:04 inet addr:98.207.132.162 Bcast:98.207.135.255 Mask:255.255.248.0 inet6 addr: 2001:558:6045:47:8ddb:8e79:dbc5:e49c/64 Scope:Global inet6 addr: fe80::6670:2ff:fe11:c204/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:31759692 errors:0 dropped:0 overruns:0 frame:0 TX packets:7939898 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:13780380258 (13141.9 Mb) TX bytes:1909035775 (1820.5 Mb) I haven't had the problem lately. I don't know if an upgraded kernel fixed it or if I did something to fix it long ago. Anyways, it hasn't been a problem for me. -- 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.

bugzilla_noreply＠novell.com

16:05

New subject: [Bug 793646] dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c4 Scott Simpson changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |NEW InfoProvider|Scott.Simpson@computer.org | --- Comment #4 from Scott Simpson 2013-08-19 16:05:15 UTC --- Removing NEEDINFO. -- 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.

bugzilla_noreply＠novell.com

27 Aug 27 Aug

22:26

New subject: [Bug 793646] dhcpcd has a bug where it sets the MTU to a size too small for IPv6 to get a DHCP address

https://bugzilla.novell.com/show_bug.cgi?id=793646 https://bugzilla.novell.com/show_bug.cgi?id=793646#c5 Jiri Bohac changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |WORKSFORME --- Comment #5 from Jiri Bohac 2013-08-28 00:26:27 CEST --- Ok, since there is no way to reproduce this and get more details, I'm closing the bug. Please reopen if you encounter this problem again. -- 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.

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