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Bug 1030813

Summary: No error when duplicate default routes added in routing table
Product: Red Hat Enterprise Linux 7 Reporter: Guangze Bai <gbai>
Component: iprouteAssignee: Petr Šabata <psabata>
Status: CLOSED NOTABUG QA Contact: BaseOS QE Security Team <qe-baseos-security>
Severity: medium Docs Contact:
Priority: high    
Version: 7.0CC: dspurek, yshao
Target Milestone: rcKeywords: Regression
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-11-15 09:08:25 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Guangze Bai 2013-11-15 08:40:00 UTC 
Description of problem:


Version-Release number of selected component (if applicable):
In a RHEL7 guest, the initial routing table is:

# ip r s
default via 192.168.122.1 dev eth0  proto static  metric 1024 
192.168.122.0/24 dev eth0  proto kernel  scope link  src 192.168.122.16

# ip route add default via 192.168.122.1 dev eth0  proto static

No error shown and check it again:

# ip r s
default via 192.168.122.1 dev eth0  proto static 
default via 192.168.122.1 dev eth0  proto static  metric 1024 
192.168.122.0/24 dev eth0  proto kernel  scope link  src 192.168.122.16 

There are two default routes. That's the problem.

How reproducible:
always

Expected results:
Ban adding the duplicate in routing table.

Additional info:
Comment 1 Guangze Bai 2013-11-15 08:42:12 UTC 
Forgot to say, I use following to reproduce:

iproute-3.10.0-6.el7.x86_64
kernel-3.10.0-48.el7.x86_64
Comment 3 Petr Šabata 2013-11-15 09:08:25 UTC 
This is not a bug, let alone a regression.  If anything, this is an RFE.  Adding identical routes with different metrics has always been possible.

Even though it doesn't make much sense at first, there may be some scenarios where users could want this.