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commit: 0dc9431bdb989231cfa20560d69aebebd487a926 |
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Author: Robin H. Johnson <robbat2 <AT> gentoo <DOT> org> |
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AuthorDate: Fri Mar 2 19:51:09 2012 +0000 |
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Commit: Robin H. Johnson <robbat2 <AT> gentoo <DOT> org> |
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CommitDate: Fri Mar 2 19:51:09 2012 +0000 |
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URL: http://git.overlays.gentoo.org/gitweb/?p=proj/openrc.git;a=commit;h=0dc9431b |
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Add a potential future problem I can see with metric calculation and interfaces that change often. |
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Signed-off-by: Robin H. Johnson <robbat2 <AT> gentoo.org> |
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--- |
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TODO | 14 ++++++++++++++ |
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1 files changed, 14 insertions(+), 0 deletions(-) |
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|
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diff --git a/TODO b/TODO |
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index cd9ac0c..ccc074b 100644 |
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--- a/TODO |
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+++ b/TODO |
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@@ -5,3 +5,17 @@ |
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- oldnet[bridging]: Review setting of bridge configuration on dynamic interface add |
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|
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- Document rc-depend binary. |
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+ |
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+- _ifindex is not a reliable means of calculating metrics: |
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+ _ifindex is used for calculating metrics for new devices but has a major |
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+ problem: Since it's only the nth entry in /proc/net/dev |
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+ And devices may be removed from that file, and reordered, you won't always |
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+ get the same result. |
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+ If you do: |
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+ - add eth0 - _ifindex (eth0=0) |
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+ - add vlan1 - _ifindex (eth0=0,vlan1=1) |
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+ - add vlan2 - _ifindex (eth0=0,vlan1=1,vlan2=2) |
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+ - rem vlan1 - _ifindex (eth0=0,vlan2=1) |
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+ - add vlan3 - _ifindex (eth0=0,vlan2=1,vlan3=2) |
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+ Now your routing table has entries for both vlan2 and vlan3 with a metric of 2. |
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+ |
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