Good day Joshua ChaitinPollak,
I've talked about mDNS across subnets a few times in this list.
Bonjour consists of two parts: multicast DNS & DNS service discovery
extensions.
You can add DNS service discovery functionality to several types of DNS
servers, including Mac OS X DNS (named). This is called Wide-Area Bonjour
by Apple.
Regardless of DNS-SD, multicast DNS will always be limited to multicast
boundaries. Sometimes you can configure routers to pass along multicast
traffic.
You said you will need to use multicast DNS across subnets. Could you
offer a little more information? Are you planning on using Bonjour? Is it
pure multicast DNS you are interested in (like .local automatic names)? Is
it DNS-SD you want? Both?
A word of warning about using Bonjour as it is currently available: RFC
1918 private IP addresses, such as 192.168.0.1 and 172.16.0.1, are treated
specially by Bonjour if you intend on using a DNS server with DNS-SD
extensions (Wide-Area Bonjour).
If you don't understand any of this and you simply want two Bonjour
services to find each other across multicast boundaries, perhaps you can
configure your router to pass on this multicast traffic, which uses the IP
address of 224.0.0.251, UDP port 5353. An alternative is to use a Bonjour
"repeater", such as Network Beacon by chaoticsoftware.com.
I hope this helps.
- Shao Miller
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