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Cisco 1941 NAT Loss

I try to configure PAT on the Cisco1941 when using source inside (LAN), I found loss 7%. However, from source outside (WAN) have no loss. The CPU is just 1%. How should I do? Is there any NAT limitation on Cisco1941?

Thank you very much.

4 REPLIES 4
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VIP Expert

Hello,

 

what do you mean with 7% loss ? Are you losing PING (ICMP) packets ? Post the running configuration of your 1941 router.

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VIP Mentor

Hello

Not enough information to understand your issue?

What wan connection do you have (mpls-lre-ppp etc..)

What routing protocols if any are you using 

What NAT are you using ( domain (inside/outside) or domainless

Are you implementing any QOS?

Have you tired a test from a host within your network instead of the rtrs lan interface?



kind regards
Paul

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Configuration:

Spoiler
interface GigabitEthernet0/0
 ip address x.170.112.222 255.255.255.252
 ip load-sharing per-packet
 ip nat outside
!
interface GigabitEthernet0/1
 ip address x.170.112.234 255.255.255.252
 ip load-sharing per-packet
 ip nat outside
!
interface Vlan100
 ip address 192.168.100.100 255.255.255.0
 ip flow ingress
 ip nat inside
!
ip nat inside source list 10 interface GigabitEthernet0/0 overload
ip nat inside source list 20 interface GigabitEthernet0/1 overload
!
access-list 10 permit 192.168.100.0 0.0.0.255
access-list 20 permit 192.168.100.0 0.0.0.255

What wan connection do you have (mpls-lre-ppp etc..)

MPLS L2VPN to the Service Provider

 

What routing protocols if any are you using

Just default route to the Internet

 

What NAT are you using ( domain (inside/outside) or domainless

Can see in the configuration

 

Are you implementing any QOS?

Nope

 

Have you tired a test from a host within your network instead of the rtrs lan interface?

Same result

 

Thank you very much.

Highlighted

Hello,

 

is there a specific reason for the 'per-packet' load sharing ? That alone could be your issue. Change that to the default 'per-destination' load balancing.

 

Also, if you use static routes, are we talking about two static default routes ? Post the output of 'show ip route'.