I am experimenting with wide area Bonjour, and have run into some puzzling
behavior of dnsextd. When Bonjour client registers a new service, it seams
that dnsextd makes a reverse lookup using IP address of the client. If the
reverse lookup fails, dnsextd still registers the service with named, using
IP address of authoritative server responding to the query. Shouldn't it
just fail the service registration, instead of registering with a wrong, but
valid and ping-able IP address? Is this a bug, or intended behavior In the
latter case, what was the intension for this puzzling behavior?
Examples
1. Bonjour name server at 10.151.1.2 is authoritative NS for subdomain
mysub.com, corresponding to IP address range 10.151.1.0/24.
A Bonjour client runs on host with IP address 10.151.1.8, it is configured
in Bonjour configuration to register and publish to mysub.com. There is no
reverse record for 8.1.151.10.in-addr.arpa in zone file db.10.151.1. In this
case, all Bonjour advertisements for 10.151.1.8 end up pointing to
10.151.1.2, which is IP address of the authoritative NS for domain mysub.com
/ IP subnet 10.151.1.x.
2. Same Bonjour name server at 10.151.1.2 as above. A Bonjour client runs on
a host behind a NAT box, and has IP address of 192.168.128.8. All Bonjour
advertisements for this client point to IP address of 192.175.48.1, which
happens to be IANA blackhole server prisoner.iana.org. I suspect that
dnsextd made a reverse lookup for 192.168.128.8, which was not in the
Bonjour name servers reverse zone, and the request went all the way up to
root NS, ending up at a blackhole server.
System details: both Bonjour name server and Bonjour client hosts run on
Leopard 1.5.3, BIND 5.4.1-P1, msdnresponder v.1.171.4 (as reported by dns-sd
-V). In example 2 NAT box between 10.5.1.x and 192.168.128.x subnets is a
Netgear with UPnP turned on.
Best regards,
Sergey Chemishkian
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