Re: Modem in T40 - stopped responding
Quoting Martin Wegmann <debian_list@web.de>:
> dmesg resonded with
>
> DROPPED IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:08:00:69:0e:3f:f4:08:00
> SRC=132.187.21.151 DST=132.187.21.255 LEN=296 TOS=0x10 PREC=0x00 TTL=60
> ID=26877 PROTO=UDP SPT=525 DPT=525 LEN=276
> DROPPED IN= OUT=eth0 SRC=132.187.21.42 DST=132.187.21.255 LEN=147 TOS=0x00
>
> PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=631 DPT=631 LEN=127
>
> (BTW what caused this output would interest me as well ;-) - I am on a
dmesg :-)
But a firewall caused the message to be logged. Exactly why, you can't tell
without checking the firewall rules - it could be be src IP or port,
destination IP or port, because it's unsolicited, because it's UDP, etc, etc.
Port 631 is usually CUPS, so 132.187.21.42 is looking for printers.
Port 525 is timed, so 132.187.21.151 is looking for the time.
Both requests are to the subnet broadcast address, so they're just looking for
anyone on 132.187.21.x to respond - and you're refusing to do so.
--
derek
Reply to: