#! /bin/sh echo 1 > /proc/sys/net/ipv4/ip_forward iptables -F iptables -t nat -F
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- Barrie Lester
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1 Dalam mengatur alur lalulintas data dalam suatu jarigan tentu dibutuhkan proses Routing. Dimana Proses Routing ini sangat berpengaruh terhadap kontinuitas dan alur kerja sistem secara berkesinambungan. Hal ini akan menjadi sangat penting karena ketika terjadi masalah dalam jaringan maka yang paling utama dilakukan cross check terhadap jaringan tersebut adalah PROSES ROUTING. Dibawah ini merupakan salah satu SCRIPT ROUTING yang dapat digunakan oleh sistem operasi linux apapun yaitu : #! /bin/sh echo 1 > /proc/sys/net/ipv4/ip_forward iptables -F iptables -t nat -F ################## # DROP ALL INPUT CHAINS # ################## iptables -P INPUT DROP iptables -A INPUT -i lo -j iptables -A INPUT -i eth0 -j iptables -A INPUT -i eth1 -j iptables -A INPUT -i eth0 -p tcp --dport 80 -j iptables -A INPUT -i eth1 -p tcp --dport 80 -j iptables -A INPUT -i eth0 -p tcp --dport 21 -j iptables -A INPUT -i eth1 -p tcp --dport 21 -j 1 / 11
2 iptables -A INPUT -i eth0 -p tcp --dport 22 -j iptables -A INPUT -i eth1 -p tcp --dport 22 -j iptables -A INPUT -i eth0 -p tcp --dport 53 -j iptables -A INPUT -i eth1 -p tcp --dport 53 -j iptables -A INPUT -i eth0 -p icmp -j iptables -A INPUT -i eth1 -p icmp -j iptables -A INPUT -p tcp --dport 110 -j iptables -A INPUT -p tcp --sport 110 -j iptables -A INPUT -p tcp --dport 143 -j iptables -A INPUT -p tcp --sport 143 -j iptables -A INPUT -p tcp --dport 111 -j iptables -A INPUT -p tcp --sport 111 -j iptables -A INPUT -p tcp --dport 993 -j iptables -A INPUT -p tcp --sport 993 -j iptables -A INPUT -p tcp --dport 995 -j iptables -A INPUT -p tcp --sport 995 -j iptables -A INPUT -p tcp --dport 25 -j iptables -A INPUT -p tcp --sport 25 -j iptables -A INPUT -p tcp -i eth0 --dport j 2 / 11
3 iptables -A INPUT -p tcp -i eth1 --dport j iptables -A INPUT -p tcp --dport 443 -j iptables -A INPUT -p udp --dport 443 -j ##################### # IP PUBLIC TO INTERNET OPEN # ##################### ip addr add xxx.xxx/29 brd + dev eth0 iptables -A INPUT -s xxx.xxx/29 -j iptables -A INPUT -d xxx.xxx/29 -j ##################### # IP PUBLIC TO INTERNET OPEN # ##################### iptables -A INPUT -s xxx.xxx/29 -j iptables -A INPUT -d xxx.xxx/29 -j iptables -A INPUT -s /24 -j iptables -A INPUT -d /24 -j #################### # IP TO BACKBONE INTERNAL # #################### ip addr add /27 brd + dev eth0 iptables -A INPUT -s /27 -j iptables -A INPUT -d /27 -j ip addr add /27 brd + dev eth0 iptables -A INPUT -s /27 -j iptables -A INPUT -d /27 -j 3 / 11
4 #echo "search pkbmcyber.net" > /etc/resolv.conf #echo "nameserver " >> /etc/resolv.conf #echo "nameserver " >> /etc/resolv.conf ################################## # DMZ # ################################## #iptables -t nat -A PREROUTING -p tcp --dport d xxx.xxx -j DNAT --to-destination :80 #iptables -t nat -A PREROUTING -p tcp --dport d xxx.xxx -j DNAT --to-destination :10000 #iptables -t nat -A PREROUTING -p tcp --dport d xxx.xxx -j DNAT --to-destination :22 iptables -t nat -A PREROUTING -p tcp --dport d xxx.xxx -j DNAT --to-destination :80 #iptables -t nat -A PREROUTING -p tcp --dport d xxx.xxx -j DNAT --to-destination :8291 #iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE #iptables -t nat -A POSTROUTING -o eth3 -j MASQUERADE #iptables -t nat -A POSTROUTING -p tcp -d dport 80 -j MASQUERADE iptables -t nat -A POSTROUTING -d j MASQUERADE ############################################################### #iptables -t nat -A POSTROUTING -s /24! -d /16 -p tcp -o ppp0 -j MASQUERADE #iptables -t nat -A POSTROUTING -s /24! -d /16 -p icmp -o ppp0 -j MASQUERADE 4 / 11
5 #iptables -t nat -A POSTROUTING --out-interface ppp0 --jump MASQUERADE #iptables -A INPUT -p tcp --dport 80 -i ppp0 -j #iptables -A INPUT -p tcp -s dport 80 -i ppp0 -j #iptables -A INPUT -p icmp -j #iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE #iptables -t nat -A POSTROUTING -s /16 -o ppp0 -j MASQUERADE #iptables -A FORWARD -s /16 -o ppp0 -j #iptables -A FORWARD -d /16 -m state --state ESTABLISHED,RELATED -i ppp0 -j #iptables -t nat -A POSTROUTING -d /8 -j #iptables -t nat -A POSTROUTING -d /24 -j #iptables -t nat -A POSTROUTING -j SNAT --to ############################################ # SAMPLE IPTABLES FOR PPPOE # ############################################ #iptables -F #iptables -t nat -F #iptables -t mangle -F #ignore if you get an error here #iptables -X #deletes every non-builtin chain in the table #iptables -A INPUT -m state --state ESTABLISHED,RELATED -j #iptables -A INPUT -m state --state NEW -i! ppp0 -j # only if both of the above rules succeed, use #iptables -P INPUT DROP #iptables -A FORWARD -i ppp0 -o eth0 -m state --state ESTABLISHED,RELATED -j #iptables -A FORWARD -i eth0 -o ppp0 -j 5 / 11
6 #iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE #iptables -A FORWARD -i ppp0 -o ppp0 -j REJECT ############################################# # DROP MAC ADDRESS # ############################################# #iptables -A INPUT -m mac --mac-source 94:39:e5:af:1b:c7 -j DROP #iptables -A INPUT -s m mac --mac-source 94:39:e5:af:1b:c7 -p all -i eth3 -j DROP #iptables -A FORWARD -s m mac --mac-source 94:39:e5:af:1b:c7 -i eth3 -j DROP #iptables -A FORWARD -m mac --mac-source 94:39:e5:af:40:ff -i eth3 -j DROP #iptables -A FORWARD -m mac --mac-source cc:af:78:d2:50:21 -i eth3 -j DROP #iptables -A FORWARD -m mac --mac-source 1c:6f:65:8b:19:67 -i eth3 -j DROP ############################################## #IP MYNET MAC ADDR => 00:13:46:3B:02:E1 (1) #iptables -A INPUT -s m mac --mac-source 94:39:e5:af:1b:c7 -p all -i eth3 -j DROP #iptables -A INPUT -s m mac --mac-source 00:13:46:3B:02:E1 -p all -i eth2 -j #iptables -A INPUT -s m mac --mac-source 00:13:46:3B:02:E1 -p all -i eth5 -j #iptables -A INPUT -s m mac --mac-source 00:13:46:3B:02:E1 -p all -i eth6 -j #iptables -A INPUT -s m mac --mac-source 00:13:46:3B:02:E1 -p all -i eth7 -j #iptables -A INPUT -s m mac --mac-source 00:13:46:3B:02:E1 -p all -i eth8 -j #iptables -A INPUT -s m state --state RELATED,ESTABLISHED -j 6 / 11
7 #iptables -A FORWARD -s m mac --mac-source 00:13:46:3B:02:E1 -i eth0 -j #iptables -A FORWARD -s m mac --mac-source 00:13:46:3B:02:E1 -i eth5 -j #iptables -A OUTPUT -d o eth3 -j DROP #iptables -A FORWARD -d o eth0 -j ################ # BLOK MAC ADDRESS # ################ #iptables -A INPUT -m mac --mac-source 00:23:cd:1e:43:73 -j DROP #iptables -A FORWARD -p tcp -m mac --mac-source 00:23:cd:1e:43:73 -j DROP #iptables -A INPUT -m mac --mac-source 00:02:6f:47:1d:f8 -j DROP #iptables -A FORWARD -p tcp -m mac --mac-source 00:02:6f:47:1d:f8 -j DROP ############## # FORWARD CHAIN # ############## #iptables -P FORWARD DROP #iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j #iptables -A FORWARD -s i eth2 -j #iptables -A FORWARD -d i eth2 -j #iptables -A FORWARD -s j #iptables -A FORWARD -d j #iptables -A FORWARD -s j #iptables -A FORWARD -d j iptables -A FORWARD -p udp --sport 69 -j DROP iptables -A FORWARD -p udp --dport 69 -j DROP iptables -A FORWARD -p tcp --sport 135 -j DROP iptables -A FORWARD -p tcp --dport 135 -j DROP iptables -A FORWARD -p udp --sport 137 -j DROP iptables -A FORWARD -p udp --dport 137 -j DROP iptables -A FORWARD -p udp --sport 138 -j DROP iptables -A FORWARD -p udp --dport 138 -j DROP iptables -A FORWARD -p tcp --sport 139 -j DROP iptables -A FORWARD -p tcp --dport 139 -j DROP 7 / 11
8 iptables -A FORWARD -p tcp --sport 445 -j DROP iptables -A FORWARD -p tcp --dport 445 -j DROP iptables -A FORWARD -p tcp --sport 593 -j DROP iptables -A FORWARD -p tcp --dport 593 -j DROP iptables -A FORWARD -p tcp --sport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP iptables -A FORWARD -p tcp --dport j DROP ################################## #IP yang di izinkan tapi tidak boleh menggunakan DDL# ################################## #for port in 6346:6348 gnutella-svc #do #iptables -A FORWARD -s /24 -p tcp -i eth1 --dport $port -j DROP #iptables -A FORWARD -s /27 -p tcp -i eth2 --dport $port -j DROP #iptables -A FORWARD -s /27 -p tcp -i eth3 --sport $port -j DROP #iptables -A FORWARD -s /27 -p tcp -i eth4 --sport $port -j DROP #iptables -A FORWARD -s /27 -p tcp -i eth5 --sport $port -j DROP #done ############### # Transparent Proxy # ############### #iptables -t nat -A PREROUTING -s /27 -i eth3 -p tcp --dport 80 -j REDIRECT #iptables -t nat -A PREROUTING -s /27 -i eth2 -p tcp --dport 80 -j REDIRECT #iptables -t nat -A PREROUTING -s /27 -i eth3 -p tcp --dport 80 -j REDIRECT 8 / 11
9 #iptables -t nat -A PREROUTING -s /27 -i eth4 -p tcp --dport 80 -j REDIRECT #iptables -t nat -A PREROUTING -s /27 -i eth5 -p tcp --dport 80 -j REDIRECT #iptables -t nat -A PREROUTING -s /29 -i eth0 -p tcp --dport 80 -j REDIRECT # File Log Book atau catatan tentang sesuatu yang masuk lewat eth1 (Link Internux) # iptables -A INPUT -i eth1 -j LOG --log-level 5 # iptables -A INPUT -i eth0 -j LOG --log-level 5 ########################################## # IP TABLES FOR PPPOE # ########################################## ##!/bin/sh #PATH=/usr/sbin:/sbin:/bin:/usr/bin ## Init table FILTER #iptables -t filter -F #Flush table #iptables -t filter -X #Delete personal chains #iptables -t filter -Z #Idem #iptables -t filter -P INPUT DROP #Default Rule #iptables -t filter -P FORWARD DROP #Default Rule #iptables -t filter -P OUTPUT #Default Rule ## Init table NAT #iptables -t nat -F #iptables -t nat -X #iptables -t nat -Z #iptables -t nat -P PREROUTING #iptables -t nat -P OUTPUT #iptables -t nat -P POSTROUTING 9 / 11
10 ## Init table MANGLE #iptables -t mangle -F #iptables -t mangle -X #iptables -t mangle -Z #iptables -t mangle -P PREROUTING #iptables -t mangle -P INPUT #iptables -t mangle -P OUTPUT #iptables -t mangle -P FORWARD #iptables -t mangle -P POSTROUTING ## Accept everything on localhost #iptables -t filter -A INPUT -i lo -j #iptables -t filter -A OUTPUT -o lo -j ## Allow everything from local network #iptables -t filter -A INPUT -s /24 -j ## Allow navigation from linux box #iptables -t filter -A INPUT -i ppp0 -m state state ESTABLISHED -j #iptables -t filter -A OUTPUT -o ppp0 -m state state NEW,ESTABLISHED -j ## NAT local network to internet #iptables -t filter -A FORWARD -i ppp0 -o eth0 -m state state ESTABLISHED,RELATED -j #iptables -t filter -A FORWARD -i eth0 -o ppp0 -j #iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE ## Allow SSH on port 443 #iptables -t filter -I INPUT -p tcp dport 443 -j ## Enable routing #echo 1 > /proc/sys/net/ipv4/ip_forward 10 / 11
11 ############################################################ By : Aliansyah - TKJ CLUB MAKASAR 11 / 11
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