Bug 574629
Summary: | dhclient sets MTU to 576 for bridge device | ||
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Product: | [Fedora] Fedora | Reporter: | Joe Conway <mail> |
Component: | dhcp | Assignee: | Jiri Popelka <jpopelka> |
Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
Severity: | high | Docs Contact: | |
Priority: | low | ||
Version: | 12 | CC: | jpopelka, warlord |
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | x86_64 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | dhcp-4.1.1-13.fc12 | Doc Type: | Bug Fix |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2010-04-22 22:34:22 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Joe Conway
2010-03-18 01:31:17 UTC
Hi Joe, thanks for the report. this is caused by fixing Bug #566873. dhclient-4.1.1-9.fc12 now requests interface-mtu (specifies the MTU to use on this interface) option from server by default. Server sends only options which it has configured to send and which the client requests. It means that your dhcp server is configured to send interface-mtu option (with value 576). You discovered it with dhclient-4.1.1-9.fc12, because from this version the client is prepared to accept it. If you don't want your client to request interface-mtu, you have to over-ride the list of default requested options. It means put the following line into /etc/dhcp/dhclient.conf: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, host-name, nis-domain, nis-servers, ntp-servers; I'm not sure how to proceed this bug. I was looking into Debian (testing) and found that the default dhclient is also requesting interface-mtu. The only difference is that in Fedora we do it in dhclient code (we don't have default dhclient.conf) and in Debian it is done via 'request' statement in default dhclient.conf Perhaps Fedora should consider a default dhclient.conf and move the interface-mtu request there so it's easier for people to turn off? Thanks -- I can confirm the 'request' statement in dhclient.conf fixes the issue for me. I agree with Derek -- I think a default dhclient.conf with a request statement would be a good idea. For example, if that had been the case I would have figured this out much more quickly when I grepped for mtu in /etc. I did a little searching and found this: http://mathema.tician.de/node/409 and especially this http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=513616 The patch http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=ignore-below-576.diff;att=1;bug=513616 and explanation seems reasonable to me. dhcp-4.1.1-11.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/dhcp-4.1.1-11.fc12 4.1.1-11.fc12 works for me -- thanks! dhcp-4.1.1-11.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update dhcp'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/dhcp-4.1.1-11.fc12 dhcp-4.1.1-12.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update dhcp'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/dhcp-4.1.1-12.fc12 dhcp-4.1.1-13.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update dhcp'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/dhcp-4.1.1-13.fc12 dhcp-4.1.1-13.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report. |