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1 file changed, 2 insertions
ufw.md
| @@ -1,5 +1,7 @@ | |||
| 1 | 1 | # UFW | |
| 2 | 2 | ||
| 3 | + | [Found on Github Gist](https://gist.github.com/kimus/9315140) | |
| 4 | + | ||
| 3 | 5 | I use Ubuntu’s Uncomplicated firewall because it is available on Ubuntu and it's very simple. | |
| 4 | 6 | ||
| 5 | 7 | ||
hash 修订了这个 Gist . 转到此修订
1 file changed, 74 insertions
ufw.md(文件已创建)
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| 1 | + | # UFW | |
| 2 | + | ||
| 3 | + | I use Ubuntu’s Uncomplicated firewall because it is available on Ubuntu and it's very simple. | |
| 4 | + | ||
| 5 | + | ||
| 6 | + | ## Install UFW | |
| 7 | + | ||
| 8 | + | if ufw is not installed by default be sure to install it first. | |
| 9 | + | ||
| 10 | + | ``` | |
| 11 | + | $ sudo apt-get install ufw | |
| 12 | + | ``` | |
| 13 | + | ||
| 14 | + | ||
| 15 | + | ## NAT | |
| 16 | + | If you needed ufw to NAT the connections from the external interface to the internal the solution is pretty straight forward. | |
| 17 | + | In the file /etc/default/ufw change the parameter DEFAULT_FORWARD_POLICY | |
| 18 | + | ||
| 19 | + | ``` | |
| 20 | + | DEFAULT_FORWARD_POLICY="ACCEPT" | |
| 21 | + | ``` | |
| 22 | + | ||
| 23 | + | Also configure /etc/ufw/sysctl.conf to allow ipv4 forwarding (the parameters is commented out by default). Uncomment for ipv6 if you want. | |
| 24 | + | ||
| 25 | + | ``` | |
| 26 | + | net.ipv4.ip_forward=1 | |
| 27 | + | #net/ipv6/conf/default/forwarding=1 | |
| 28 | + | #net/ipv6/conf/all/forwarding=1 | |
| 29 | + | ``` | |
| 30 | + | ||
| 31 | + | ||
| 32 | + | The final step is to add NAT to ufw’s configuration. Add the following to /etc/ufw/before.rules just before the filter rules. | |
| 33 | + | ||
| 34 | + | ``` | |
| 35 | + | # NAT table rules | |
| 36 | + | *nat | |
| 37 | + | :POSTROUTING ACCEPT [0:0] | |
| 38 | + | ||
| 39 | + | # Forward traffic through eth0 - Change to match you out-interface | |
| 40 | + | -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE | |
| 41 | + | ||
| 42 | + | # don't delete the 'COMMIT' line or these nat table rules won't | |
| 43 | + | # be processed | |
| 44 | + | COMMIT | |
| 45 | + | ``` | |
| 46 | + | ||
| 47 | + | ||
| 48 | + | Now enable the changes by restarting ufw. | |
| 49 | + | ||
| 50 | + | ``` | |
| 51 | + | $ sudo ufw disable && sudo ufw enable | |
| 52 | + | ``` | |
| 53 | + | ||
| 54 | + | ||
| 55 | + | ## FORWARD | |
| 56 | + | ||
| 57 | + | For port forwardind just do something like this. | |
| 58 | + | ||
| 59 | + | ``` | |
| 60 | + | # NAT table rules | |
| 61 | + | *nat | |
| 62 | + | :PREROUTING ACCEPT [0:0] | |
| 63 | + | :POSTROUTING ACCEPT [0:0] | |
| 64 | + | ||
| 65 | + | # Port Forwardings | |
| 66 | + | -A PREROUTING -i eth0 -p tcp --dport 22 -j DNAT --to-destination 192.168.1.10 | |
| 67 | + | ||
| 68 | + | # Forward traffic through eth0 - Change to match you out-interface | |
| 69 | + | -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE | |
| 70 | + | ||
| 71 | + | # don't delete the 'COMMIT' line or these nat table rules won't | |
| 72 | + | # be processed | |
| 73 | + | COMMIT | |
| 74 | + | ``` | |
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