Created
December 27, 2017 23:31
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will configure a linux machine to route multicast trafic and start a dhcp server
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| #!/bin/bash | |
| #stop on error | |
| set -e | |
| LOCAL_IF="enp2s0" | |
| UPSTREAM_IF="enp2s0" | |
| ifconfig ${LOCAL_IF} 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 | |
| # Disabled by default! | |
| echo "1" > /proc/sys/net/ipv4/ip_forward | |
| # Load various modules. Usually they are already loaded | |
| # (especially for newer kernels), in that case | |
| # the following commands are not needed. | |
| # Load iptables module: | |
| modprobe ip_tables | |
| # activate connection tracking | |
| # (connection's status are taken into account) | |
| modprobe ip_conntrack | |
| # Special features for IRC: | |
| modprobe ip_conntrack_irc | |
| #Special features for FTP: | |
| modprobe ip_conntrack_ftp | |
| iptables -t nat -A POSTROUTING -o ${UPSTREAM_IF} -j MASQUERADE | |
| echo 40 > /proc/sys/net/ipv4/igmp_max_msf | |
| echo "2" > /proc/sys/net/ipv4/conf/${LOCAL_IF}/force_igmp_version | |
| #forward all multicast traffic | |
| ip route add 224.0.0.0/4 dev ${LOCAL_IF} | |
| #setup dhcp server | |
| cat <<EOF | |
| option domain-name-servers 192.168.1.1; | |
| option subnet-mask 255.255.255.0; | |
| option routers 192.168.2.1; | |
| subnet 192.168.2.0 netmask 255.255.255.0 { | |
| range 192.168.2.150 192.168.2.250; | |
| } | |
| EOF > /tmp/dhcpd_tmp.conf | |
| #start dhcp server | |
| /usr/bin/dhcpd -4 -q -cf /tmp/dhcpd_tmp.conf -pf /run/dhcpd4.pid ${LOCAL_IF} |
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