Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations Chriss Miller on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

Cisco dynamic NAT

Status
Not open for further replies.

itd17

IS-IT--Management
Joined
Jan 24, 2002
Messages
84
Location
US
I have a Cisco 2610 performing NAT from 20 inside users and 5 public ip's.

My question is when the 6th concurrent user 'plugs into the network', will he/she use the 1st public ip in the scope?

Any insight would be greatly appreciated.

 
i believe when you use ip nat inside source list <acl> pool <name> overload

that it chooses your wan ip on a round robin basis
so as long as youtr nat pool has all the ips defined in it you should be using them all.
you could simply overload all your connections onto a single ip address through if you wanted as well.
 
If you are using NAT only, when the sixth user plugs in, they will not be natted since the address pool is exhausted. The result will be the sixth user probably won't be able to get outside the LAN.

If you use PAT, then all users will share the same IP address and connections will be overloaded. The only difference in configruation for NAT verses PAT is to add the keyword "overload" to the translation syntax.

ip nat inside source list 10 pool MYPOOL !this is NAT

ip nat inside source list 10 pool MYPOOL overload !this is PAT
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top