Thanks for the guidance! In my simulation, I have one more issue... I want to block traffic in nodes, wifi interface, but iptables rules don't seem to block the UDP packetes from MIH in port 4551 (discovery beacons?)... I've tried

iptables -A INPUT -i adhoc -j REJECT iptables -A OUTPUT -o adhoc -j REJECT

iptables -A FORWARD -i adhoc -o adhoc -j REJECT iptables -A FORWARD -i adhoc -o adhoc -j REJECT

ip6tables -A INPUT -i adhoc -j REJECT ip6tables -A OUTPUT -o adhoc -j REJECT

iptables -A INPUT -m pkttype --pkt-type multicast -j REJECT iptables -A OUTPUT -m pkttype --pkt-type multicast -j REJECT

iptables -A FORWARD -m pkttype --pkt-type multicast -j REJECT iptables -A FORWARD -m pkttype --pkt-type multicast -j REJECT

But I can not simulate connectivity loss, beacause udp packets in port 4551 keep on comming, although these rules are applied... anyone tried iptables for simulation of connectivity loss with ibr-dtn?