Bug 9624
| Summary: | Should be able to set MTU via ifcfg-ethX file | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Dave O'Neill <dave> |
| Component: | initscripts | Assignee: | Bill Nottingham <notting> |
| Status: | CLOSED RAWHIDE | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.1 | CC: | rvokal |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2001-06-06 00:32:33 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: | |||
Added as of initscripts-5.02-1. Has this bug resurfaced in 7.1?
The new ifup script has:
153:ifconfig ${DEVICE} ${IPADDR} netmask ${NETMASK} broadcast ${BROADCAST} \
$(toggle_value arp $ARP) \
$(toggle_value promisc $PROMISC) \
$(toggle_value allmulti $ALLMULTI)
It only reads and sets MTU if interface does not specify IP:
135:if [ -z "${IPADDR}" ]; then
# enable device without IP, useful for e.g. PPPoE
ifconfig ${DEVICE} up ${MTU:+mtu $MTU}
exec /etc/sysconfig/network-scripts/ifup-post ${CONFIG} ${2}
fi
I verified that this was fine in 7.0. Yes this bug does exist in 7.1, to reproduce, simply add an MTU=xxx line in /etc/sysconfig/network-scripts/ifcfg-ethx then restart the network, you will see that after running ifconfig that the MTU is still set to the old value where 'ifconfig ethx mtu 1300' on the command line will change the MTU on the running interface well this little patch seems to fix it... 91a92,95 > if [ -n "${MTU}" ]; then > ifconfig ${DEVICE} mtu ${MTU} > fi > 152c156 < --- > Fixed in CVS, will be in 5.93-1 or later. |
It would be nice to be able to set the MTU for an interface via the appropriate ifup-XXXX file in /etc/sysconfig/network-scripts. The patch below allows setting of the MTU with 'MTU=nnnn' in said file. --- ifup.old Sun Apr 18 19:36:47 1999 +++ ifup Fri Oct 15 20:11:03 1999 @@ -102,7 +102,13 @@ eval `/bin/ipcalc --network ${IPADDR} ${NETMASK}` fi - ifconfig ${DEVICE} ${IPADDR} netmask ${NETMASK} broadcast ${BROADCAST} + if [ "foo$MTU" != "foo" ]; then + SETMTU="mtu $MTU" + else + SETMTU="" + fi + + ifconfig ${DEVICE} ${IPADDR} netmask ${NETMASK} broadcast ${BROADCAST} ${SETMTU} # don't re-add subnet route on 2.2 kernels, but add a route # to a non-local subnet. # stupid hack, but it should work