Using iptraf
I am seeing the following
Code: Select all
IGMP (46 bytes) from BrightBox.ee to all-systems.mcast.net (src HWaddr my router mac) on eth0 │
│ IGMP (46 bytes) from BrightBox.ee to all-systems.mcast.net (src HWaddr my router mac) on eth0
│ ARP request for 192.xxx.x.xxx (366 bytes) from my router mac to ffffffffffff on eth0 │
│ ARP reply from 192.xxx.x.xxx (366 bytes) from my pc mac to my router mac on eth0
so i get that IGMP is internet group management protocol meaning i am in some internet group - who actually puts me in a group? is it default by my isp, is it an app on my pc? do i need this and if not how do i leave the groups i am in?
next is all-systems.mcast.net so i understand this is a multicasting address inside my local network, which only consists of my router and my pc, if i only have one device why is my router using multicasting? is it possible to disable this (can't find anything inside the router) and will it make a difference if i do? i would prefer not to be transmitting to loads of devices, i have disabled multicasting on my eth0 using ifconfig eth0 -allmulti and ifconfig eth0 -multicast so i assumed it should stop. Also i am NOT using any voip or similar like skype/hexchat etc
Next is the ARP requests, why is there a mac address showing as ffffffffffffff? as far as i can see it goes from router to mystery mac then comes back from pc to router, I understand ARP is needed so should be left as is, unless using static ip address(?) but why does it not go router>pc>router? is the ffffffffffffff just some default value or is it something i should be worrying about?
sorry if these are noob questions but i'm seriously struggling to get clear answers by searching online, there's too much conflicting info so i need some help - thanks