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userdoc:tt-internal-downstream-router [2016/05/30 16:19]
abelbeck [Internal Downstream Router]
userdoc:tt-internal-downstream-router [2016/05/30 16:21] (current)
abelbeck [Internal Downstream Router]
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 While AstLinux offers many firewall and networking features, there are situations where an additional internal downstream router may play into the mix.  That router may be pre-existing before AstLinux is added, or a router that offers added value such as subscription based content filtering. While AstLinux offers many firewall and networking features, there are situations where an additional internal downstream router may play into the mix.  That router may be pre-existing before AstLinux is added, or a router that offers added value such as subscription based content filtering.
  
-When an additional internal downstream router NAT's the LAN interfaces to its external interface, the process is pretty much plug-and-play since AstLinux sees all the downstream traffic as coming from a single IPv4 address on one of its internal interfaces. ​ This practice has a couple negative side effects such as Double-NAT of the internal router'​s LAN devices to the public Internet, and limiting AstLinux'​s ability to filter the router'​s traffic by IPv4 address.+When the additional internal downstream router NAT's the LAN interfaces to its external interface, the process is pretty much plug-and-play since AstLinux sees all the downstream traffic as coming from a single IPv4 address on one of its internal interfaces. ​ This practice has a couple negative side effects such as Double-NAT of the internal router'​s LAN devices to the public Internet, and limiting AstLinux'​s ability to filter the router'​s traffic by IPv4 address.
  
 Provided the additional internal downstream router can disable NAT and "​route"​ the LAN traffic to the upstream AstLinux, AstLinux can be configured to perform NAT for the internal router to the public Internet. Provided the additional internal downstream router can disable NAT and "​route"​ the LAN traffic to the upstream AstLinux, AstLinux can be configured to perform NAT for the internal router to the public Internet.