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New Member

Losing pings to router port but not devices through that port.

I have a remote 2621 router running IOS 2.1(15). When I ping F0/0 I lose 20-30% of the pings, but I don't lose any pings when I ping devices that are through F0/0 like the switch that is connected to F0/0, or any of the hosts on that switch. There are no errors on F0/0 or dropped packets either.

What could be causing this?

Here is an output of 'show f0/0':

ELC-R01-01#sh int f0/0

FastEthernet0/0 is up, line protocol is up

Hardware is AmdFE, address is 0002.4b13.a240 (bia 0002.4b13.a240)

Internet address is 164.72.212.129/25

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:09, output 00:00:00, output hang never

Last clearing of "show interface" counters 03:07:13

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue :0/40 (size/max)

5 minute input rate 7000 bits/sec, 12 packets/sec

5 minute output rate 7000 bits/sec, 8 packets/sec

150849 packets input, 38195494 bytes

Received 1844 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

147157 packets output, 50065475 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

4 REPLIES
Silver

Re: Losing pings to router port but not devices through that por

where are you pinging from ?

Also what does the switch port look like that is connected to this router ,

are you running hsrp ? cef ?

what do the ping drops look like ? is there a pattern ?

New Member

Re: Losing pings to router port but not devices through that por

1. I'm pinging from a PC to this remote router through S0/0 to F0/0.

2. F0/0 is connected to the B port of a 1924 which is a 100mbTX port. That switch is 164.72.212.145. It is full duplex also and show no errors, or dropped packets.

3. No hsrp or cef is running.

4. Here is the ping output to F0/0 164.72.212.129, and then 164.72.212.145 the switch:

Pinging 164.72.212.129 with 32 bytes of data:

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Request timed out.

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Request timed out.

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Request timed out.

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Reply from 164.72.212.129: bytes=32 time<10ms TTL=253

Ping statistics for 164.72.212.129:

Packets: Sent = 14, Received = 11, Lost = 3 (21% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 0ms, Average = 0ms

-------------------

Pinging 164.72.212.145 with 32 bytes of data:

Reply from 164.72.212.145: bytes=32 time=10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Reply from 164.72.212.145: bytes=32 time<10ms TTL=252

Ping statistics for 164.72.212.145:

Packets: Sent = 16, Received = 16, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 10ms, Average = 0ms

Gold

Re: Losing pings to router port but not devices through that por

You're probably just hitting the rate limiting for ping relplies.... This is pretty normal.

Russ.W

Silver

Re: Losing pings to router port but not devices through that por

what is the gateway of the switch is it .129 or another device ? what happens when you ping .129 sourcing from another interface on the router or from the .145 address ?

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