will anyone please tell me how to understand this?

["Folke Aeon" <aeon_folke@xxxxxxxxxxx>]

hi, all

i run the following scripts :
tc qdisc add dev eth0 handle ffff: ingress
tc filter add dev eth0 parent ffff: protocol ip \
    pref 4 u32 match ip dst 10.0.0.1 flowid :1
tc filter add dev eth0 parent ffff: protocol ip \
    pref 5 u32 match ip dst 10.0.0.2 flowid :2

then , i do:
[root@router bin]# tc filter ls dev eth0 parent ffff:
filter protocol ip pref 4 u32
filter protocol ip pref 4 u32 fh 801: ht divisor 1
filter protocol ip pref 4 u32 fh 801::800 order 2048 key ht 801 bkt 0 flowid 
:2
  match 0a000002/ffffffff at 16
filter protocol ip pref 4 u32 fh 800: ht divisor 1
filter protocol ip pref 4 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 
:1
  match 0a000001/ffffffff at 16
filter protocol ip pref 5 u32
filter protocol ip pref 5 u32 fh 801: ht divisor 1
filter protocol ip pref 5 u32 fh 801::800 order 2048 key ht 801 bkt 0 flowid 
:2
  match 0a000002/ffffffff at 16
filter protocol ip pref 5 u32 fh 800: ht divisor 1
filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 
:1
  match 0a000001/ffffffff at 16


  what confused me is : since i only add exact only one
filter at both priority 4 and priority 5 respectively,
why the filter list shows that there are two filters
in both priority 4 and priority 5?

in other words, the filter :
filter protocol ip pref 4 u32 fh 801::800 order 2048 key ht 801 bkt 0 flowid 
:2
  match 0a000002/ffffffff at 16

and the filter :
filter protocol ip pref 5 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 
:1
  match 0a000001/ffffffff at 16
is both unexpected.

  and now, if there is a ip flow with a dst address 10.0.0.2,
then how can i tell which filter will it be matched,
the one with the pref 4 or the one with the pref 5?

any help will be appreciated.

folke.


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