How to ACCEPT multicast connection with iptables's rule?

Question

I obtain this row with iptables logging option:

IN= OUT=eno49 SRC=192.168.0.72 DST=224.1.0.2 LEN=196 TOS=0x00 PREC=0x00 TTL=5 ID=53310 DF PROTO=UDP SPT=9100 DPT=8100 this packet is DROPPED

I think this is a multicast connection.

Which is the rule that accept this packet?

score 1 · Accepted Answer · answered Oct 04 '16 at 14:08

1

You have to specify you want to accept multicast. For example, based on your logs :

iptables -A OUTPUT -o eno49 -p udp --dport 8100 -m pkttype --pkt-type multicast -j ACCEPT

answered Oct 04 '16 at 14:08

setenforce 1

'--sport 9100' is necessary? – karmax Oct 04 '16 at 14:27
Nothing is necessary but `-m pkttype --pkt-type multicast`, I just wanted to give an accurate example. – setenforce 1 Oct 04 '16 at 14:52

1 Answers1