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URL: https://forum.netgate.com/topic/91157/how-to-allow-access-to-gmail-ip-space-keeps-changing
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HOW TO ALLOW ACCESS TO GMAIL, IP SPACE KEEPS CHANGING

Firewalling

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 * T
   ttblum
   zuletzt editiert von 3. Nov. 2015, 14:58
   
   
   Hello,
   
   I'm doing egress filtering on my LAN, so I have it set up so that the LAN can
   access access certain e-mail servers.  I'm running version 2.1.3 on an Alix
   on this network.
   
   I added a rule to allow e-mail ports (aliased to 25, 110, 993, 465, 587, 443)
   to Gmail servers (aliased to imap.gmail.com and smtp.gmail.com).  However,
   the firewall was still blocking IMAP access from the LAN to Gmail, even
   though they were using the pfsense router to resolve DNS.
   
   I got the traffic flowing through OK by hardcoding Gmail's IP space into the
   alias: 74.125.0.0/16, 173.194.0.0/16 .
   
   This week, however, it looks like Google added more IP ranges for Gmail, and
   I had to hardcode them again: 209.85.128.0/17, 64.233.160.0/19 .
   
   Is there any way to be able to adapt to future changes with services like
   this?
   
   1 Antwort Letzte Antwort Antworten Zitieren 0
   
 * A
   awebster
   zuletzt editiert von 3. Nov. 2015, 15:03
   
   
   Have a look at this info from Google
   https://support.google.com/a/answer/60764?hl=en
   You can use dig _netblocks.google.com to determine what address IPv4 blocks
   are in there, and put them into your filter.
   Just put them into an IP alias so you don't need to keep touching the rules.
   
   There is no automatic method to do this, but I've found that it hasn't
   changed much over time.
   
   64.18.0.0/20
   64.233.160.0/19
   66.102.0.0/20
   66.249.80.0/20
   72.14.192.0/18
   74.125.0.0/16
   108.177.8.0/21
   173.194.0.0/16
   207.126.144.0/20
   209.85.128.0/17
   216.58.192.0/19
   216.239.32.0/19
   
   –A.
   
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