Re: Working on howl port

[Peter Heerboth]

I'm not a zeroconf expert per se, but I would love to see FreeBSD have 
a great zeroconf implementation.  Here are some things to think about.

If your first implementation happens to leave the interface with a 
169.254 IP address, it's doing something it shouldn't, however that is 
likely to be mostly harmless until you or someone has a chance to 
improve the implementation.
If a device does keep its link local address once it obtains a lease 
from a DHCP server or the user manually enters an address, it is 
important that it stops responding to A record queries with its 
169.254/16 address.  Depending upon the IP implementations of the other 
devices on the network, the freebsd box may appear unreachable.  
Imagine this situation:  My freebsd box initially has a link local 
address, it later obtains a DHCP address on 10.0.1/24.  Now other 
devices with 10.0.1/24 addresses on the network need to use services 
advertised on my freebsd box.  If the multicast DNS daemon on the 
Freebsd box responds to A record queries for its host name with the 
169.254/16 address, subsequent TCP connection attempts from a device 
without a link local address may quite possibly fail.  I believe most 
mDNS implementations have interfaces to the multicast DNS daemon that 
allow the programmer to build a list of IP addresses resolved for a 
hostname by interface, but I'm not sure how many people are this 
thorough.

Also, how is Freebsd going to handle IPv4 link local addresses on 
multi-homed hosts?  Does FreeBSD have a notion of a "primary" interface 
like Mac OS X?  If FreeBSD assigns v4 link-local address to all its 
interfaces, then the link-local address for each device on each network 
to which my FreeBSD device is attached must be unique across all 
networks, or the routing implications are obvious.

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Re: Working on howl port

[Bruce M Simpson]

On Sat, Dec 11, 2004 at 10:02:35AM +0100, Andrea Campi wrote:
> just a quick note to let concerned parties know I have started
> working on the howl port. As mentioned on the dingo page, the goal
> is to have a fully working BSD-licensed implementation of zeroconf.

Yes please! Much of what ended up as 'Dingo' has been on my list for the
last year or so.

I am currently wrapping things up in Berkeley for the holidays. I will be
back in the UK for a month, so I should have some free time to catch up
on FreeBSD things.

Once again, thanks for looking at this! I will try to help when/where I can.

BMS
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