Bug 132006

Summary: Suggestion: Disallow source routed packets by default
Product: [Fedora] Fedora Reporter: Troels Arvin <troels>
Component: initscriptsAssignee: Bill Nottingham <notting>
Status: CLOSED NEXTRELEASE QA Contact: Brock Organ <borgan>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: rvokal
Target Milestone: ---Keywords: FutureFeature
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2004-11-17 03:32:52 EST Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description Troels Arvin 2004-09-07 15:36:54 EDT
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Description of problem:
Fedora's default /etc/sysctl.conf disallows ip forwarding by default,
and it turns on the rp_filter sanity checks. That's nice.

However, I believe that sysctl.conf should also contain a line like this:
net.ipv4.conf.default.accept_source_route = 0

I've looked over various articles about source routed packets, and
they all suggest that an operating system should normally be
configured to drop them (openbsd and recent Solaris versions drops
them by default, I've heard - while Linux and Windows don't drop such
packets). Except for certain debugging purposes, handling of source
routed packets seem to be relevant only in some large
router-installations, it seems.

Source routed packets are bad because they can be used for IP spoofing.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
Check out /etc/sysctl.conf in any recent version of the initscript
package, and check out the value of
/proc/sys/net/ipv4/conf/default/accept_source_route on a fresh Fedora
installation (don't know about pre-RH62 installations).

Additional info:
Comment 1 Troels Arvin 2004-11-17 03:33:53 EST
Bug report was for FC2. Seems fixed in FC3, thanks.