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Thread: Should I allow port 5353/udp?

  1. #1
    Join Date
    Apr 2009
    Xubuntu 18.04 Bionic Beaver

    Should I allow port 5353/udp?

    My ufw.log is filling up with these:
    Nov 13 13:10:44 BSWZ1S1 kernel: [ 7576.948054] [UFW BLOCK] IN= OUT=wlan0 SRC= DST= LEN=135 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=115 
    Nov 13 13:27:48 BSWZ1S1 kernel: [ 8599.689459] [UFW BLOCK] IN= OUT=wlan0 SRC=fe80:0000:0000:0000:ae72:89ff:fec9:08f1 DST=ff02:0000:0000:0000:0000:0000:0000:00fb LEN=155 TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=UDP SPT=5353 DPT=5353 LEN=115
    Should I allow that port?

  2. #2
    Join Date
    Nov 2009
    Ubuntu 12.04 Precise Pangolin

    Re: Should I allow port 5353/udp?

    Allowing it would make the messages go away. It's mDNS traffic, probably from the avahi-daemon process. You can kill that process to make the messages go away, but it will come back when you reboot. It's not really necessary but I don't think it does much harm.


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