7206-VXR Packet Loss problem on internal Interface

[tdg911]

Over the past couple of weeks I've had numerous problems pop-up when we relocated our office and changed upstream providers. Most of those problems have been addressed and fixed. However, I still seem to have an ongoing problem that I do not know how to fix.

the problem is as follows:

I connect to my upstream via fiber interface with the IP address of 63.166.76.254 (my side of interface). I have been monitoring this inferface for a couple of weeks now and it is running error free. My internal net Interface is F0/0 which is 69.45.250.1/24 (I recently moved this to F5/0).

The problem is when pinging 69.45.250.1 I receive 50% + packet loss. When pinging the 63.166.76.254 address with a count of 1000 there is no packet loss whatsoever. It seems that anything I ping past the upstream interface is dropping at least 50% of the packets.

I have a static route of 0.0.0.0 0.0.0.0 63.166.76.253 (upstream interface). I have seen this problem before a few years ago and I do not remember the fix. All of the traceroutes from the outside appear to be fine. Any suggestions?

Thanks in advance,

Troy

[smif101]

This is a very odd problem indeed. Can you post the config of your router for us to see. The first thing I would check on your ethernet interface though is to ensure you don't have some speed or duplex issue. Also if you ping from the router to 63.166.76.253 do you drop any packets there or just from the ethernet side. Have you tried doing a ping from your router using the ethernet interface as the source and see if you have the same problem. It could be a routing issue with your ISP, maybe its trying to do some sort of load balancing.

[tdg911]

Sure I'll post the config at the bottom of this message. I had previously wiped the config to start from scratch to make sure I didnt have anything in the config that would cause this problem. This routers F5/0 is plugged directly into a machine just to keep it in an upstate. I had re-arranged my network to go around this problem. So basically the 7206 is just sittting there until I can find the fix.

To answer your question about pinging upstream interface, there is no packet-loss at all.

Basic config:

Current configuration : 1789 bytes

!

version 12.2

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname ds-rtr

!

logging queue-limit 100

enable password **********

!

ip subnet-zero

ip cef

!

!

no ip domain-lookup

!

call rsvp-sync

!

!

!

!

!

!

controller T1 1/0

framing esf

linecode b8zs

!

controller T1 1/1

framing esf

linecode b8zs

!

controller T1 1/2

framing esf

linecode b8zs

!

controller T1 1/3

framing esf

linecode b8zs

!

controller T1 2/0

framing esf

linecode b8zs

!

controller T1 2/1

framing esf

linecode b8zs

!

controller T1 2/2

framing esf

linecode b8zs

!

controller T1 2/3

framing esf

linecode b8zs

!

!

!

interface FastEthernet0/0

description

no ip address

no ip redirects

no ip proxy-arp

load-interval 30

shutdown

duplex full

!

interface Ethernet3/0

no ip address

shutdown

duplex half

!

interface Ethernet3/1

no ip address

shutdown

duplex half

!

interface Ethernet3/2

no ip address

shutdown

duplex half

!

interface Ethernet3/3

no ip address

shutdown

duplex half

!

interface Serial4/0

no ip address

shutdown

framing c-bit

cablelength 10

dsu bandwidth 44210

serial restart-delay 0

!

interface FastEthernet5/0

ip address 69.45.250.1 255.255.255.0

no ip proxy-arp

no ip redirects

no ip route-cache

no ip mroute-cache

load-interval 30

duplex full

!

interface FastEthernet6/0

description Uplink

ip address 63.166.76.254 255.255.255.252

no ip redirects

no ip proxy-arp

no ip route-cache

no ip mroute-cache

load-interval 30

duplex full

!

ip classless

ip route 0.0.0.0 0.0.0.0 63.166.76.253

no ip http server

!

snmp-server community ******** RO

snmp-server enable traps tty

!

dial-peer cor custom

!

!

!

!

gatekeeper

shutdown

!

!

line con 0

line aux 0

line vty 0 4

password ********

login

!

end

[smif101]

I am a little confused because you state in your first post

"It seems that anything I ping past the upstream interface is dropping at least 50% of the packets."

But you state in your second post that you don't have any packet loss to 63.166.76.253. So from what I get right now is that

1. From the workstation you get packet loss pinging to 69.45.250.1

2. From the workstation you are good to IP 63.166.76.254

3. From the workstation you are good to IP 63.166.76.253

4. From the workstation you get packet loss pinging anything after 63.166.76.253

5. From the router with a source of Fa5/0 to IP 63.166.76.253 ?? Is this good?

6. From the router with a source of Fa5/0 to anything after 63.166.76.253 ?? Is this good?

I would hardcode the speed and duplex on the workstation too. Have you used a differnt workstation? Have you tried a different ethernet ports on the router for both the local and remote side?