NAT/ PAT Todd Lammle 6th edition
Manglian
Member Posts: 58 ■■□□□□□□□□
in CCNA & CCENT
Hi there
In his book Lammle gives two answers ( page 678-679) for poblem below and i do not understand the
the second solution ( bold line ). Can a pool contain two address from different ip addresses (from different classes )
The problem
The border router needs to be configured with NAT. Six public ip addresses 192.1.2.109 through
114.However, on the inside network there are 63 hosts that use private addressess of 192.168.10.65 through 126.
What would be your NAT configuration be ont border router ?
In the first solution
Ip nat pool Todd 192.1.2.109 192.1.2.109 netmask 255.255.255.248
access-list 1 permit 192.168.10.64 0.0.0.63
ip nat inside source list 1 pool Todd overload
In second answer
The second answer would end up with exact same result of having only 192.1.2.109 as your inside global but you can type this in and and have it work too
IP nat pool Todd 102.1.2.105 192.1.2.110 netmask 255.255.255.248
This is waste because the second through sixth ip addresses would be used if there was a conflict with a TCP port number
Any help would be really appreciated
In his book Lammle gives two answers ( page 678-679) for poblem below and i do not understand the
the second solution ( bold line ). Can a pool contain two address from different ip addresses (from different classes )
The problem
The border router needs to be configured with NAT. Six public ip addresses 192.1.2.109 through
114.However, on the inside network there are 63 hosts that use private addressess of 192.168.10.65 through 126.
What would be your NAT configuration be ont border router ?
In the first solution
Ip nat pool Todd 192.1.2.109 192.1.2.109 netmask 255.255.255.248
access-list 1 permit 192.168.10.64 0.0.0.63
ip nat inside source list 1 pool Todd overload
In second answer
The second answer would end up with exact same result of having only 192.1.2.109 as your inside global but you can type this in and and have it work too
IP nat pool Todd 102.1.2.105 192.1.2.110 netmask 255.255.255.248
This is waste because the second through sixth ip addresses would be used if there was a conflict with a TCP port number
Any help would be really appreciated
Comments
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scorphe
Member Posts: 18 ■□□□□□□□□□
what don't you understand??the first answer is the best and the second answer can also be acceptable...though it is a waste of IP addresses that's why the first answer is the best...!
want more???"read between the lines...take it or leave it...! -
Manglian
Member Posts: 58 ■■□□□□□□□□
Thanks guys I have answer from author of book through his forum.
So the second possible answer is
ip nat pool Todd 192.1.2.105 192.1.2.110 netmask 255.255.255.248
Actually since it is block of 8 and all this happened because of mistake so 105-110 is in the 104 sebnet
Cheers