Dec 19, 2013

Double Trouble: How to Deal with Double NAT on Your Network To check for double NAT on your network, log into your router and look up the IP address of its WAN port. If you see an address in the 10.x.x.x or 192.168.x.x range (both of which are private) it means that the device your router's WAN port connects to is doing NAT, and hence, you're dealing with double NAT. Speedtest by Ookla - The Global Broadband Speed Test Test your Internet connection bandwidth to locations around the world with this interactive broadband speed test from Ookla What is NAT?

Open Port Check Tool This is a free utility for remotely verifying if a port is open or closed. It is useful to users who wish to verify port forwarding and check to see if a server is running or a firewall or ISP is blocking certain ports.

This web site is provided by the U.S. Department of Justice to provide a free nationwide search for sex offenders registered by states, territories, Indian tribes, and the District of Columbia. NSOPW is the only national sex offender search site with direct access to registered sex offender information from the individual registration jurisdictions. Network Address Translation is an Internet standard that allows hosts on local area networks to use one set of IP addresses for internal communications and another set of IP addresses for external communications. A LAN that uses NAT is referred as natted network. For NAT to function, there should be a NAT gateway in each natted network. Open NAT is nearly impossible, even with DMZ and port forwarding. The issue that makes everyone say “seek Type 1 / Open / No NAT” is that many home routers destroy all NAT every half hour or forty five minutes or hour or whenever they run out of room for NAT entries. This is crappy and stupid. when ASA check a server/host with dynamic NAT (ACL or Network) if find a match in the outside interface but drop the connection 3) we know that this behavior can be solved by adding a NAT exception for the dynamic NAT in the "outside" interface (nat (inside) 0 access-list Inside-NAT-Exceptions) but :

Network Address Translation (NAT) is a networking mode designed to conserve IP addresses by mapping an external IP address and port to a much larger set of internal IP addresses. Basically, a NAT uses a flow table to route traffic from an external (host) IP Address and port number to the correct internal IP address associated with an endpoint

I want to be able to see the actual NAT translations on my 5545 ASA. Basically, I need the equivalent of "show ip nat translations" that a router would have. I opened a case with TAC and they couldn't help me. It seems like a basic trouble shooting command to get a table of translations. Show xlate, Solved: ASA rpf-check DROP, ASA checking NAT in - Cisco