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Diffstat (limited to 'examples/nat-hacks/tg13')
| -rw-r--r-- | examples/nat-hacks/tg13/iptables-dnat-hack.txt | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/examples/nat-hacks/tg13/iptables-dnat-hack.txt b/examples/nat-hacks/tg13/iptables-dnat-hack.txt new file mode 100644 index 0000000..caa36a4 --- /dev/null +++ b/examples/nat-hacks/tg13/iptables-dnat-hack.txt @@ -0,0 +1,140 @@ +Since several services thought our IP's didn't belong to Norway, they sent us +to CDN's in Japan, Africa, and some other weird countries. NRK nett-tv also +didn't think we was in Norway, hence it did not let you stream things. Action +had to be taken. + +We had a /24 from our ISP that we knew would be recognized as Norwegian. We +therefore decided to NAT everything related to those services behind that /24. +We had to figure out all the destination prefixes used for the different +services, and only NAT sessions going to those networks. Tests showed that even +if Origin was being NATed behind "Norwegian IPs", it would still connect to +lol-CDN. We then decided to DNAT all connections to these specific IPs. We +found a suitable Origin-CDN hosted at Telenor/Canal Digital, that would accept +connections. + +In the process of setting this up, we found out that Cisco ASR1k doesn't (at +the time, at least) support more than _one_ DNAT-entry (with the same +destination, at least). iptables to the rescue. + +Two 10gig-interfaces was set up. One as the 'inside', and the other as the +'outside'. + +The solution worked flawlessly, and peaked at about ~2Gbps of traffic. + +## IPTABLES START +*filter +:INPUT DROP [0:0] +:FORWARD ACCEPT [497:117797] +:OUTPUT ACCEPT [0:0] +-A INPUT -i lo -j ACCEPT +-A INPUT -i gre5 -j ACCEPT +-A INPUT -i eth2 -j ACCEPT +-A INPUT -p icmp -j ACCEPT +-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT +-A INPUT -j DROP +-A FORWARD -i eth3 -o gre5 -m state --state RELATED,ESTABLISHED -j ACCEPT +-A FORWARD -i gre5 -o eth3 -j ACCEPT +-A OUTPUT -o lo -j ACCEPT +-A OUTPUT -j ACCEPT +COMMIT +# NAT +*nat +:PREROUTING ACCEPT [1073:112412] +:POSTROUTING ACCEPT [65:16154] +:OUTPUT ACCEPT [2:129] +:nataccept - [0:0] +-A PREROUTING -d 23.15.8.0/24 -j DNAT --to-destination 148.123.13.49 +-A PREROUTING -d 23.32.241.0/24 -j DNAT --to-destination 148.123.13.49 +-A PREROUTING -d 120.29.145.0/24 -j DNAT --to-destination 148.123.13.49 +-A PREROUTING -d 124.40.32.0/24 -j DNAT --to-destination 148.123.13.49 +-A PREROUTING -d 125.56.200.0/24 -j DNAT --to-destination 148.123.13.49 +-A POSTROUTING -s 151.216.0.0/17 -o eth3 -j nataccept +-A nataccept -j LOG --log-prefix "iptables nat accept " +-A nataccept -j SNAT --to-source 31.169.55.2-31.169.55.254 +COMMIT +## IPTABLES END + + +## Cisco ACL +! +ip access-list extended steamorigin + remark TEST + 10 permit ip 151.216.0.0 0.0.127.255 158.37.91.0 0.0.0.255 + remark ORIGIN + 100 permit ip 151.216.0.0 0.0.127.255 23.15.8.0 0.0.0.255 + 110 permit ip 151.216.0.0 0.0.127.255 23.21.0.0 0.0.255.255 + 120 permit ip 151.216.0.0 0.0.127.255 23.23.0.0 0.0.255.255 + 130 permit ip 151.216.0.0 0.0.127.255 23.32.241.0 0.0.0.255 + 140 permit ip 151.216.0.0 0.0.127.255 23.46.0.0 0.0.255.255 + 300 permit ip 151.216.0.0 0.0.127.255 50.16.0.0 0.0.255.255 + 310 permit ip 151.216.0.0 0.0.127.255 50.17.0.0 0.0.255.255 + 320 permit ip 151.216.0.0 0.0.127.255 54.225.0.0 0.0.255.255 + 400 permit ip 151.216.0.0 0.0.127.255 81.21.146.0 0.0.0.255 + 500 permit ip 151.216.0.0 0.0.127.255 107.20.244.0 0.0.0.255 + 510 permit ip 151.216.0.0 0.0.127.255 120.29.145.0 0.0.0.255 + 520 permit ip 151.216.0.0 0.0.127.255 124.40.32.0 0.0.0.255 + 530 permit ip 151.216.0.0 0.0.127.255 125.56.200.0 0.0.0.255 + 540 permit ip 151.216.0.0 0.0.127.255 164.177.139.0 0.0.0.255 + 550 permit ip 151.216.0.0 0.0.127.255 184.73.0.0 0.0.255.255 + 560 permit ip 151.216.0.0 0.0.127.255 204.236.239.0 0.0.0.255 + remark STEAM + 5100 permit ip 151.216.0.0 0.0.127.255 72.165.61.0 0.0.0.255 + 5110 permit ip 151.216.0.0 0.0.127.255 81.171.115.0 0.0.0.255 + 5120 permit ip 151.216.0.0 0.0.127.255 87.248.217.0 0.0.0.255 + 5300 permit ip 151.216.0.0 0.0.127.255 103.28.54.0 0.0.0.255 + 5310 permit ip 151.216.0.0 0.0.127.255 146.66.152.0 0.0.0.255 + 5500 permit ip 151.216.0.0 0.0.127.255 205.185.220.0 0.0.0.255 + 5510 permit ip 151.216.0.0 0.0.127.255 208.64.200.0 0.0.0.255 + 5520 permit ip 151.216.0.0 0.0.127.255 209.197.0.0 0.0.255.255 + 5530 permit ip 151.216.0.0 0.0.127.255 212.187.201.0 0.0.0.255 + remark NRK-TV + 9000 permit ip 151.216.0.0 0.0.127.255 23.8.146.0 0.0.0.255 + 9010 permit ip 151.216.0.0 0.0.127.255 46.137.77.0 0.0.0.255 + 9020 permit ip 151.216.0.0 0.0.127.255 50.16.209.0 0.0.0.255 + 9030 permit ip 151.216.0.0 0.0.127.255 50.16.231.0 0.0.0.255 + 9040 permit ip 151.216.0.0 0.0.127.255 50.17.243.0 0.0.0.255 + 9050 permit ip 151.216.0.0 0.0.127.255 54.225.239.0 0.0.0.255 + 9060 permit ip 151.216.0.0 0.0.127.255 54.243.145.0 0.0.0.255 + 9070 permit ip 151.216.0.0 0.0.127.255 54.243.68.0 0.0.0.255 + 9080 permit ip 151.216.0.0 0.0.127.255 65.52.155.0 0.0.0.255 + 9090 permit ip 151.216.0.0 0.0.127.255 77.88.106.0 0.0.0.255 + 9100 permit ip 151.216.0.0 0.0.127.255 82.96.58.0 0.0.0.255 + 9110 permit ip 151.216.0.0 0.0.127.255 94.245.71.0 0.0.0.255 + 9120 permit ip 151.216.0.0 0.0.127.255 160.68.205.0 0.0.0.255 + 9130 permit ip 151.216.0.0 0.0.127.255 174.129.219.0 0.0.0.255 + 9140 permit ip 151.216.0.0 0.0.127.255 184.28.17.0 0.0.0.255 + 9150 permit ip 151.216.0.0 0.0.127.255 184.73.220.0 0.0.0.255 + 9160 permit ip 151.216.0.0 0.0.127.255 204.245.63.0 0.0.0.255 + 9170 permit ip 151.216.0.0 0.0.127.255 204.236.234.0 0.0.0.255 +! + +## Cisco route-map +!!!! telegw; +! +route-map nat-madness permit 10 + match ip address steamorigin + set ip next-hop 151.216.0.57 +! +! +interface Port-channel2 + ip policy route-map nat-madness +! +interface Port-channel3 + ip policy route-map nat-madness +! +interface TenGigabitEthernet4/4 + ip policy route-map nat-madness +! + +!!!! nocgw +! +route-map nat-madness permit 10 + match ip address steamorigin + set ip next-hop 151.216.125.6 +! +! +interface vlan 124 + ip policy route-map nat-madness +! +! + |