On Thu, Mar 8, 2012 at 4:57 PM, Michael Richardson <[email protected]> wrote:
>
>
> >>>>> "Jim" == Jim Gettys <[email protected]> writes:
> >> (%)-one need not have a globally reachable name. One might be
> >> registering into .homenet/.lan/.local. This may be for the
> >> benefit of machines which are still at home, and which need to
> >> find your laptop. Or the home user might have a global DNS
> >> name. The difference is really just a matter of NS/DS records.
>
> Jim> BTW, it appears Dave Taht has mDNS forwarding working between
> Jim> networks in CeroWrt using Avah; but we need to do more testing.
>
> so, basically it's just a proxy?
yes. they call it a 'reflector'. From avaha-daemon's man page
Section [reflector]
enable-reflector= Takes a boolean value ("yes" or "no"). If set to
"yes" avahi-daemon will reflect incoming mDNS requests to all local
network interfaces, effectively allowing clients to browse mDNS/DNS-SD
services on all networks connected to the gateway. The gateway is
somewhat intelligent and should work with all kinds of mDNS traffic,
though some functionality is lost (specifically the unicast reply bit,
which is used rarely anyway). Make sure to not run multiple reflectors
between the same networks, this might cause them to play Ping Pong
with mDNS packets. Defaults to "no". reflect-ipv= Takes a boolean
value ("yes" or "no"). If set to "yes" and enable-reflector is
enabled, avahi-daemon will forward mDNS traffic between IPv4 and IPv6,
which is usually not recommended. Defaults to "no".
...
there are other problems with the mdns spec, notably the TTL figure is
fixed, making routing problematic, even if multicast routing worked
worth beans.
>
> Jim> I don't think that is the only place where we may have such
> Jim> issues; SNMP comes to mind, but I don't know how commonly that
> Jim> is used in home environments. - Jim
>
> SNMP is unused in home networks.
> I don't know why there is any issue with SNMP though.
>
The elephant in the room is that we no longer have E2E connectivity in
much of the world, so centralized polling utilities
such as those that use snmp, can't work through the multiple layers of NAT.
The edge has gone dark.
I wouldn't claim that snmp is unused in home networks, but it is
sorely underused, as the relevant monitoring utilities are complex to
setup and maintain.
I've been explicitly enabling snmp over ipv6, I note, and using tools
such as those available from 'dartware'
--
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://www.bufferbloat.net
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