Cisco Interface Saturation - Top Talker Script Interpretation

Hello Community,
We've been experiencing high utilisation on our interface, to the point where the rx is full saturated, see below:
ukxxxx-rm01-xx#show int atM 0/1/0
ATM0/1/0 is up, line protocol is up
  Hardware is MPC ATMSAR, address is 6073.5cd8.95a6 (bia 6073.5cd8.95a6)
  Description: Internet Connection
  MTU 1600 bytes, sub MTU 1600, BW 448 Kbit/sec, DLY 820 usec,
     reliability 255/255, txload 137/255, rxload 255/255
I decided to apply the attached script to determine what might be causing the saturation. I have also attached an explanation of how the script works.
Can someone please help me interpet the output?
The culprit is the source ip 194.75.x.x to 80.229.x.x with prot ESP and AvgBits/s 1.19M and AVGpkt/s 175.
I don't know how to interpret the results...
Any explanation would greatly appreciated.
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ESP is typically used for VPN tunnels.  Do you have a site to site VPN tunnel?
cpatte7372Author Commented:
Thanks for responding.

Yes we do have a VPN site to site VPN tunnel.
cpatte7372Author Commented:
Hello Experts,

Attached are the configs for the the hub and spoke routers.

Thanks for your help.
O.K., all that traffic is the traffic flowing through the VPN.

So you either need to upgrade the link or figure out what the real traffic is and verify that it should be flowing over the VPN.

To see what the real traffic is you will need to capture the traffic as it goes into one of the routers based on real destination addresses of the other side of the VPN tunnel.

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cpatte7372Author Commented:
Cheers mate.
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