Cisco SPVTG

[jredman1]

Why am I dropping over half the packets to the default gateway IP of the modem that is installed from the Cisco router connected to it?

I can ping OpenDNS and google ip addresses fine and Internet seems fine but I worry if my bandwidth usage to the internet goes up. Comcast replaced the modem. Does Comcast need to change something in their Cisco SPVTG ISP modem?

ip route 0.0.0.0 0.0.0.0 96.72.32.246

ip route 8.8.4.4 255.255.255.255 96.72.32.246

ping 96.72.32.246 rep 50
Type escape sequence to abort.
Sending 50, 100-byte ICMP Echos to 96.72.32.246, timeout is 2 seconds:
!!!!!!!!!!!.!.!!!!!!!!!!.!........................
Success rate is 46 percent (23/50), round-trip min/avg/max = 1/2/4 ms

r1-76160826#ping 8.8.4.4 rep 250 si 1000
Type escape sequence to abort.
Sending 250, 1000-byte ICMP Echos to 8.8.4.4, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (250/250), round-trip min/avg/max = 24/27/44 ms

[balaji.bandi]

p route 0.0.0.0 0.0.0.0 96.72.32.246

ip route 8.8.4.4 255.255.255.255 96.72.32.246

You do not second route specific to 8.8.4.4 - since you have already had default route

below both outcomes from  Modem?  - i am thinking maybe provided will have some kind of security or policy in place, when you try to ping -96.72.32.246 ( you can check with ISP and confirm)

1-76160826#ping 8.8.4.4 rep 250 si 1000
Type escape sequence to abort.
Sending 250, 1000-byte ICMP Echos to 8.8.4.4, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (250/250), round-trip min/avg/max = 24/27/44 ms

what is outcome with less MTU how you did with google IP ? to provider ?

[jredman1]

You are correct. I did not need the route to 8.8.8.8 but still the pings are dropping to the default gateway ip that is on the Cisco SPVTG modem?

I did remove the packet size and still packet drop only to DG.

Pings to other DNS sites all work.

ping 96.72.32.246 rep 50
Type escape sequence to abort.
Sending 50, 100-byte ICMP Echos to 96.72.32.246, timeout is 2 seconds:
!!!!!!!!!!!.!......................!!!!!!!!!!!.!..
Success rate is 48 percent (24/50), round-trip min/avg/max = 1/2/4 ms

ping 8.8.8.8 rep 50
Type escape sequence to abort.
Sending 50, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (50/50), round-trip min/avg/max = 24/26/32 ms

[jredman1 · Accepted solution]

Thank you for your help. I have my hands tied at contacting the ISP provider as the circuit belongs to the client. They said they are seeing not issue even though I can not ping the modem gateway ip? 

I am just going to shrug my shoulders and say the ISP just did not turn off a security feature on their modem as you spoke of.

Thanks again.