Quote:
Originally Posted by amboxer21
UDP port 5353 is open on my computer. Do I need this port open? I know what dns is but have no idea what a multicast DNS is. I assume it is something of a group like nature.
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mDNS isn't really that like DNS; it uses a DNS-like protocol, although it is broadcast from devices advertising their capabilities. It also has a variety of names. Avahi, Bonjour and others are all implementations of broadly the same thing, although different versions may have slightly different capabilities.
You may not need any of this
if you have configured all of the networking stuff (router, printer, file server...whatever is relevant) manually, but, if you are relying on automatic configuration of any of this stuff, it'll stop wotking once you block this protocol.
Quote:
Originally Posted by amboxer21
My network has been very laggish and connections often timeout.
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What have you done to pin this down? It really shouldn't have anything to do with mDNS unless eg, the primary DNS server is set to something that doesn't exist (or is only intermittently accessible), and you are falling over from the primary to the secondary.
Mind you, that can be done without mDNS, so0 it is still not clear that mDNS is the only possible cause.
Quote:
Originally Posted by amboxer21
Apparently I cannot block access to this port lol I know that my computer needs the dns in order to access the web but I always thought by default it used port 53. Not port 5353. I did not change it from 53 to 5353. How can I change it back?
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I don't know why you can't block this port. What iptables rules did you use, there might have been an error?
The default for dns is port 53. You probably haven't changed that, but that's unconnected with mDNS (although, if something that doesn't listen on 53 uses mDNS to tell the rest of the network that it does listen on port 53, that could be problematic, but you don't need to block mDNS to cure that, just configure the devices that advertise resources to advertise them correctly).