Red Hat Bugzilla – Bug 60587
Bringing up a dummy interface causes error message
Last modified: 2014-03-16 22:25:55 EDT
From Bugzilla Helper:
User-Agent: hippie/0.01 [en] (VGA; U; some O/S)
Description of problem:
Bringing up a dummy interface, though seems to function, has issues with an
error reported upon ifup'ing the interface, IF the NETMASK is set to
255.255.255.255. This has to be the netmask, as we want to avoid adding network
routes on the dummy interface.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Create /etc/sysconfig/network-scripts/ifcfg-dummy0 with the following
(with a.b.c.d being an actual address of course)
2. run "ifup dummy0"
3. See the output:
RTNETLINK answers: File exists
Actual Results: The other thing to note (which is different than the 6.2
behavior, which does work by the way) is the routing table entries that are
created. After upping the interface, the routing table looks like such:
0.0.0.0 0.0.0.0 255.255.255.255 UH 40 0 0 dummy0
192.168.6.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0
172.16.52.0 0.0.0.0 255.255.252.0 U 40 0 0 eth1
127.0.0.0 0.0.0.0 255.0.0.0 U 40 0 0 lo
0.0.0.0 192.168.6.51 0.0.0.0 UG 40 0 0 eth0
I would have expected the entry for dummy0 to look like:
a.b.c.d 0.0.0.0 255.255.255.255 UH 40 0 0 dummy0
(where a.b.c.d is that real IP address assigned to the dummy interface and seen
from the output of ifconfig -a)
Expected Results: Described in "actual results"
Closing bugs on older, no longer supported, releases. Apologies for any lack of
If this persists on a current release, such as Fedora Core 4, please open a new bug.