Yes this is exactly what I want to accomplish, but I was not sure if my setup / understanding was right.
Thanks for the links, actually I started to read those before posting on the ML. Any though anyone ? On Mon, Aug 2, 2010 at 12:07 PM, garry baker <[email protected]> wrote: > > > ' ip multicast helper-map' converts broadcast traffic to multicast traffic > to be sent across a multicast capable network and then turned back to > broadcast... > > i think you are wanting to change the multicast address and unicast it? not > sure about that one? > > here is more info on ' ip multicast helper-map' > > http://blog.ine.com/2008/05/06/understanding-the-ip-multicast-helper-map-command/ > http://www.cisco.com/en/US/docs/ios/ipmulti/command/reference/imc_03.html#wp1058167 > > > -- > Garry L. Baker > > "There is no 'patch' for stupidity." - www.sqlsecurity.com > > > On Mon, Aug 2, 2010 at 4:30 PM, Johan <[email protected]> wrote: >> >> Hi List >> >> I have an interesting case, I would like to route mDNS through 2 subnets. >> >> The topology is quite simple : >> Network 172.16.0.0/16 >> >> HostA-----Fa0/0----R1------Fa0/1----HostB >> 10.2 10.1 11.1 11.2 >> >> The communication doesn't have to be bi-directionnal, only from HostA to >> HostB. >> >> As far as I know, mDNS uses 224.0.0.251 and the port UDP 5053. >> >> That said, this is a local-link multicast address and it will then no >> traverse R1. >> >> My idea is like this >> >> Int fa0/0 >> ip address 172.16.10.1 255.255.255.0 >> ip multicast helper-map 224.0.0.251 172.16.11.1 100 >> >> >> Int fa0/1 >> ip address 172.16.11.1 255.255.255.0 >> ip multicast helper-map broadcast 224.0.0.251 100 >> >> access-list 100 permit udp any any eq 5053 >> >> Could you confirm my understanding of ip multicast helper-map ? or >> point me where I am wrong ? >> >> On fa0/0, R1 will convert the multicast received on 224.0.0.251 and >> forward it to fa0/1 as broadcast. >> On fa0/1, R1 will reconvert it as multicast and forward the packet to >> the other segment. >> >> thanks ! >> >> Johan >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
