Created
October 19, 2011 08:52
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One-liner to get gmail CIDRs (and add to ufw)
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| dig gmail.com txt | grep redirect= | cut -d'=' -f3- | cut -d'"' -f1 | xargs -I{} dig {} txt | egrep '^[^;].*TXT' | cut -d'"' -f2 | tr " " "\n" | grep ^ip4: | cut -d':' -f2- | xargs -I{} sudo ufw allow from {} to any proto tcp port 25 |
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