Slow speed when classic NVI vs NAT using

2801 software (C2801-ADVENTERPRISEK9-M), M6 Version 15.1 (4)

I recently upgraded a WAN IP DHCP to a static public IP block and discovered a problem with the PIN to hair. I looked around and found that I could use the NVI (nat interface) to work around this problem. I have everything changed, and now I'm getting less then half the speed as before. (15mbps vs 35-40mbps). Summing up when using nat inside/outside, I get good speed but can not Hairpin, but when the use of nat enable (INB), I can hairpin but bad get speeds.

Find below everything explained out in more detail.

Here's my original config

----------------------

int fa0/0

IP address x.x.x.2

NAT outside IP

int fa0/1

IP address y.y.y.2

IP nat inside

IP nat inside source list 1 interface FastEthernet0/0 overload

--------------------------

Everything has been/is just fine, but I wanted to remap some static IP addresses with two hosts, so I added.

---------------------------

IP nat inside source static y.y.y.3 x.x.x.3

IP nat inside source static y.y.y.4 x.x.x.4

----------------------------

It worked with the mapping, I tried to make a few turns (to connect to the y.y.y.4 x.x.x3) and found that it would not work. After some research, I found that the NVI, Cisco said in a statement awhile back and I move on to that. See the new config-

---------------------------

int fa0/0

IP address x.x.x.2

activate nat IP

int fa0/1

IP address y.y.y.2

activate nat IP

IP nat source list 1 interface fa0/0 overload

y.y.y.3 static IP nat source x.x.x.3

y.y.y4 static IP nat source x.x.x.4

------------------------

Just as it works but now I have less then half the speed that I did before. I'm at a loss as to what this would cause.

Performance with the traditional configuration were already very high for such old and slow router, compare to the attached document.

Then with the more complex configuration of NVI, they are always reasonable.

If you need better, either find a way to return to the regular NAT, or you need to upgrade to a more recent machine / faster.

Tags: Cisco Network

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