Bug 474645
| Summary: | network scripts don't set interface MTU when bridging is enabled | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Eduardo Habkost <ehabkost> |
| Component: | initscripts | Assignee: | initscripts Maintenance Team <initscripts-maint-list> |
| Status: | CLOSED DUPLICATE | QA Contact: | BaseOS QE <qe-baseos-auto> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.4 | CC: | notting, ovirt-maint |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2008-12-04 18:58:07 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: | |||
*** This bug has been marked as a duplicate of bug 463014 *** |
Description of problem: When an interface is configured to be attached to a bridge, the MTU= line on ifcfg-ethX is ignored by the network setup scripts. Version-Release number of selected component (if applicable): initscripts-8.45.19.1.EL-1 How reproducible: Always. Steps to Reproduce: # cat ifcfg-eth0 # Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express DEVICE=eth0 BOOTPROTO=none HWADDR=00:19:B9:45:C2:CA ONBOOT=yes BRIDGE=br0 MTU=9000 # cat ifcfg-br0 TYPE=Bridge DEVICE=br0 BOOTPROTO=dhcp ONBOOT=yes # ifup eth0 # ifup br0 Determining IP information for br0... done. # ip link show eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:19:b9:45:c2:ca brd ff:ff:ff:ff:ff:ff Actual results: eth0 MTU kept as 1500. Expected results: eth0 MTU to be set as specified on ifcfg-eth0. Additional info: Bridging configuration is common on virtualization setups, and increasing the MTU on network interfaces that support that is a recommended way of improving network performance. Being able to configure the MTU of interfaces attached to bridges is important on those cases. Two patches from the upstream Fedora initscripts fix this issue (but they involve bonding also, so a simpler fix is possible for mtu/bridging setup only). http://git.fedorahosted.org/git/?p=initscripts.git;a=commitdiff;h=15850b0 http://git.fedorahosted.org/git/?p=initscripts.git;a=commitdiff;h=f9cfaa36