RHEL server generates broadcast packets to port 631

Solution Unverified - Updated -


After upgrading some servers from RHEL 6 to RHEL 7, other servers firewall logs are flooded with rejected messages from printer server, like the following:

Mar  2 16:47:54 hostname kernel: [1872713.958195] FINAL_REJECT: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:12:34:56:78:9a:bc:de SRC= DST= LEN=337 TOS=0x00 PREC=0x60 TTL=64 ID=29643 DF PROTO=UDP SPT=631 DPT=631 LEN=317


  • Red Hat Enterprise Linux (RHEL) 7 and 8
  • Common Unix Printing System (CUPS) 1.6.3 and 2.2.6

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