Hi, I want to use 3rd octet in the ip address for creating hashng filters ? How do I do it? Venkatesh K
On Mon, 24 Nov 2003 09:52:30 +0530 "Venkatesh. K" <venkatesh@cbayscribe.com> wrote:> Hi, > > I want to use 3rd octet in the ip address for creating hashng filters? > > How do I do it?Hi, what about this (two level hashing with the 3rd and the 4th octet): FILTER_ADD="/sbin/tc filter add dev imq0 parent 1:0 protocol ip" # 1st level - 3rd octet (mask 0x0000ff00) $FILTER_ADD handle 2: u32 divisor 256 $FILTER_ADD u32 ht 800:: match ip dst 0/0 \ hashkey mask 0x0000ff00 at 16 link 2: # 2nd level - 4th octet (mask 0x000000ff) for i in $(seq 0 255); do n=$(printf "%x" $i) $FILTER_ADD handle $n: u32 divisor 256 $FILTER_ADD u32 ht 2:$n match ip dst 0/0 \ hashkey mask 0x000000ff at 16 link $n: done # hexa 10.11.12.13 -> c:d hexa() { local IFS=''.'' set $1 printf "%x:%x" $3 $4 } # example: put 10.11.12.13 into the class 1:42 ip=10.11.12.13 $FILTER_ADD u32 ht $(hexa $ip) match ip dst $ip flowid 1:42 Something like that is working for me for about half a year. If you need "match ip src", use "at 12" instead of "at 16". HTH -- Martin Volf _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
----- Original Message ----- From: "Martin Volf" <mv@inv.cz> To: <lartc@mailman.ds9a.nl> Sent: Monday, November 24, 2003 11:37 PM Subject: Re: [LARTC] use 3rd octet as hashkey> On Mon, 24 Nov 2003 09:52:30 +0530 > "Venkatesh. K" <venkatesh@cbayscribe.com> wrote: > > > Hi, > > > > I want to use 3rd octet in the ip address for creating hashng filters? > > > > How do I do it? > > Hi, > > what about this (two level hashing with the 3rd and the 4th octet): > > > FILTER_ADD="/sbin/tc filter add dev imq0 parent 1:0 protocol ip" > > # 1st level - 3rd octet (mask 0x0000ff00) > $FILTER_ADD handle 2: u32 divisor 256 > $FILTER_ADD u32 ht 800:: match ip dst 0/0 \ > hashkey mask 0x0000ff00 at 16 link 2:I had thought about the above line. I have not been able understand hashkey/mask of u32 filter fully as very little documentation is available. I will try this out. Thanks for the tip. Venkatesh K _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/