NAT problem ISR4431, connect to internet but very slow

[egomezb]

Hello. I have problems with ISR4431 with I have configured as internet edge, but it seem like NAT works but the speed is very slow. When I use the public IP without NAT it connect to internet very fast but when I use NAT and configured in my PC connected to ISR4431 with a privet IP then the internet turn slower. Also the speedtest doesn't work, it shows latency failure.

Somebody help me !!!

[leoingle]

I'd say the first thing you need to do is paste a show run so ppl can see what and how your configured.

[Georg Pauwen]

Hello,

make sure your basic configuration looks similar to the one below (important parts marked in bold, IP addressing is arbitrary):

service timestamps debug datetime msec
service timestamps log datetime msec
no platform punt-keepalive disable-kernel-core
!
hostname ISR4331
!
boot-start-marker
boot-end-marker
!
vrf definition Mgmt-intf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
no aaa new-model
!
ipv6 multicast rpf use-bgp
!
multilink bundle-name authenticated
!
redundancy
mode none
!
interface GigabitEthernet0/0/0
description Link to ISP
ip address 79.77.67.65 255.255.255.252
ip nat outside
negotiation auto
!
interface GigabitEthernet0/0/1
description LAN
ip address 192.168.1.1 255.255.255.0
ip nat inside
negotiation auto
!
interface GigabitEthernet0/0/2
no ip address
negotiation auto
!
interface GigabitEthernet0/0/3
no ip address
negotiation auto
!
interface GigabitEthernet0
vrf forwarding Mgmt-intf
no ip address
negotiation auto
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat inside source list 1 interface GigabitEthernet0/0/0 overload
!

ip route 0.0.0.0 0.0.0.0 79.77.67.66

!
access-list 1 permit 192.168.1.0 0.0.0.255
!
control-plane
!
line con 0
stopbits 1
line vty 0 4
login
!
end

[egomezb]

Hello. Thank you for your answer. The configuration in ISR4431 is the same as you showed.

[curdubanbogdan]

Hello,

Please give us the results of the following commands:

show process cpu sorted

show process memory sorted

show logs -> it will be important during the day when you have problems

show int wan_int_id | i err

show int wan_int_id | i duplex

Thank you

[paul driver]

Hello

---

@egomezb wrote:

 When I use the public IP without NAT it connect to internet very fast but when I use NAT and configured in my PC connected to ISR4431 with a privet IP then the internet turn slower. Also the speedtest doesn't work, it shows latency failure.

---

Can you confirm what dns servers the clients are pointing too?
Have you tried using a ip address instead of a dns FQDN just to to see if the response is any better?
what software version is running on the rtr please?

What speedtest are you using?