topic Re: Multicast disabling.. in Operating System - HP-UX

Multicast disabling..

Vijeesh CTK — Wed, 20 Feb 2002 12:48:46 GMT

hi gurus,

can u help me in disabling MUTICAST thru ifconfig command.
an0: flags=843
inet 137.99.200.12 netmask ffff0000 broadcast 137.99.255.255

TIA

Vijeesh CTK

Re: Multicast disabling..

harry d brown jr — Wed, 20 Feb 2002 14:21:12 GMT

Personally I'd wait for Rick Jones to respond, because there might be some ndd setting, but until then look at mrouted.

live free or die
harry

Re: Multicast disabling..

Helen French — Wed, 20 Feb 2002 14:23:39 GMT

CTK =))

See this, it may help you:

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B9106-90008/B9106-90008_top.html&con=/hpux/onlinedocs/B9106-90008/00/02/243-con.html&toc=/hpux/onlinedocs/B9106-90008/00/02/243-toc.html&searchterms=multicasting&queryid=20020220-061827

HTH,
Shiju

Re: Multicast disabling..

Helen French — Wed, 20 Feb 2002 14:27:04 GMT

Dey,

Also this:

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90691/B2355-90691_top.html&con=/hpux/onlinedocs/B2355-90691/00/02/232-con.html&toc=/hpux/onlinedocs/B2355-90691/00/02/232-toc.html&searchterms=multicasting&queryid=20020220-061545

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90725/B2355-90725_top.html&con=/hpux/onlinedocs/B2355-90725/00/00/40-con.html&toc=/hpux/onlinedocs/B2355-90725/00/00/40-toc.html&searchterms=multicasting&queryid=20020220-061545

HTH,
Shiju

Re: Multicast disabling..

Vijeesh CTK — Wed, 20 Feb 2002 14:36:21 GMT

hello shiju,

thanks for the reply.

innu savio undayirunnu chattil kure neram kathy vechu

Regards,

Vijeesh CTK

Re: Multicast disabling..

Vijeesh CTK — Wed, 20 Feb 2002 14:41:07 GMT

Hi shiju,

Congrats.... for ur Great performance.. ur ITRC Royalty now...

Vijeesh CTK

Re: Multicast disabling..

Helen French — Wed, 20 Feb 2002 14:42:30 GMT

Dey CT,

just came in ! savio enthu paranju ? mail viduka okay ?

hey, why do u want to disable the MULTICAST option ? Almost all document doesn't have a proper method of using this. Check all security options before making any changes !

Shiju

Re: Multicast disabling..

K.Vijayaragavan. — Wed, 20 Feb 2002 14:53:33 GMT

see the commands,

#ndd -h unsupported

or

#ndd -h unsupported | grep ip_respond_to_echo_broadcast

we can disable multicast by issu ing the below mentioned command but man page of ndd says it is not suggested. But if none of the software or os part is using this then you may diable if you decide to do so.

/ndd -set /dev/ip ip_respond_to_echo_broadcast 0

-Vijay

Re: Multicast disabling..

Helen French — Wed, 20 Feb 2002 14:57:13 GMT

Thanks CTK ! nice day !

Shiju

Re: Multicast disabling..

Ron Kinner — Wed, 20 Feb 2002 15:14:15 GMT

expect all that the multicast indicates is that the NIC and its driver can handle multicasts. That means you can join a multicast group and receive a multicast broadcast. It does not mean that your PC is multicasting and loading up the LAN with extra packets.

Unless you have specifically joined a multicast group or are running mrouted and are relaying multicasts from one network to another the multicast capability of your PC has no effect on your network.

Default TTL on a multicast is 1 so it won't be routed accidentally.

You can also look at mrinfo or at the igmp stats in netstat -s to see what is going on in multicast.

Look at
lanadmin
lan
display

then compare the number of inbound unicast packets received with the number of inbound non-unicast packets received. Cisco recommends that this ratio should be about 5 to 1 or better. Look at the outbound ratio to see if your PC is contributing to the problem.

If your network is full of trash broadcasts you might need to look for Windows machines running netbeui or netware or Compaq PCs running their stupid diagnostic manager software. Put a sniffer on it and see what sort of stuff you are seeing.

If it is a performance issue then make sure that you are not relying on autonegotiate to set the speed and duplex. This should be set manually on both ends of the circuit on all circuits.

Ron