On 15/07/07 05:48, Andrew Morton wrote:
> On Sat, 14 Jul 2007 15:34:31 -0700 (PDT) [EMAIL PROTECTED] wrote:
>
>> http://bugzilla.kernel.org/show_bug.cgi?id=8756
>
> It is unclear which kernel version this applies to?
Linus' 2.6 tree, as of Mon Jul 9 15:50:56 2007 -0700
For some reason it says "Version: 2.5" on the email and "Version: " on
the website...
>
>>Summary: Route advmss copied to ALL routes when interface MTU
>> changes
>>Product: Networking
>>Version: 2.5
>> Platform: All
>> OS/Version: Linux
>> Tree: Mainline
>> Status: NEW
>> Severity: normal
>> Priority: P1
>> Component: IPV6
>> AssignedTo: [EMAIL PROTECTED]
>> ReportedBy: [EMAIL PROTECTED]
>>
>>
>> Steps to reproduce:
>> 1. Have multiple network devices and routes for them with standard (low, i.e.
>> 1500) MTUs and default ADVMSS (e.g. 1440)
>> 2. Change the MTU on one of them to something high (e.g. 7200)
>> 3. The ADVMSS is incorrectly set for ALL routes based on the new MTU of the
>> interface that changed.
>>
>> Note: if addrconf is running then the ADVMSS will be reset on the next RA, so
>> this will impede attempts to reproduce.
>>
>> # ip -6 r
>> fe80::/64 dev sit0 metric 256 expires 4481744sec mtu 1480 advmss 1440
>> hoplimit 4294967295
>> fe80::/64 dev ppp0 metric 256 expires 19071345sec mtu 1500 advmss 1440
>> hoplimit 4294967295
>> fe80::/64 dev eth0 metric 256 expires 19072430sec mtu 1500 advmss 1440
>> hoplimit 4294967295
>> default dev ppp0 metric 1024 expires 19071347sec mtu 1500 advmss 1440
>> hoplimit 4294967295
>>
>> # ifconfig eth0 mtu 7200
>>
>> # ip -6 r
>> fe80::/64 dev sit0 metric 256 expires 4481732sec mtu 1480 advmss 7140
>> hoplimit 4294967295 <-- wrong
>> fe80::/64 dev ppp0 metric 256 expires 19071334sec mtu 1500 advmss 7140
>> hoplimit 4294967295 <-- wrong
>> fe80::/64 dev eth0 metric 256 expires 19072419sec mtu 7200 advmss 7140
>> hoplimit 4294967295 <-- correct
>>
>> Explicitly setting the MTU on these other routes (although this is not
>> possible
>> without having to add another route due to bug 8755) automatically sets
>> ADVMSS
>> appropriately.
>>
--
Simon Arlott
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