topic Passing Multicast through a Pix in Network Security

Passing Multicast through a Pix

thstagman — Mon, 11 Mar 2019 19:31:19 GMT

I have quite a simple set up. But for the life of me I cannot see why a rule keeps blocking my multicast traffic.

(Addressing is made up)

In essence I have one server that has a unicast address of 172.30.1.1/24 and it is multi-casting out on 234.1.1.1

the rule says : -

permit udp 172.30.1.1 234.1.1.1

The more I look at the rule, the more it looks wrong, but I don't know why - if that makes any sense ..

Is there a special way to write a rule to allow multicast traffic through ?

Bets Regards

Mike

Jennifer Halim — Fri, 07 Jan 2011 02:58:46 GMT

PIX in routed mode does not support multicast passthrough. Only in transparent mode, multicast passthrough is supported.

Hope that answers your question.

thstagman — Fri, 07 Jan 2011 10:03:21 GMT

Thanks Jennifer

Can you run a Pix in both Transparent and Routed mode ?

I have other "normal" routed sessions going on through the firewall and through the same interface as it happens.

Mike

Jennifer Halim — Fri, 07 Jan 2011 11:51:26 GMT

No, unfortunately you can't run the PIX in transparent and routed mode at the same time. You can only run one at the time.