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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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PC Download Rate Is Slow

PC Download Rate Is Slow

This section provides a case that the PC download rate is slow.

Networking

Fault Symptom

The PC download rate is very slow and different from the actual bandwidth.

The configuration of the AR is as follows:

#
interface Ethernet2/0/0
ip address 1.1.1.2 255.255.255.0
 nat outbound 2000 address-group 0
 nat server protocol tcp global 1.1.1.1 8080 inside 192.168.2.9 8080
 nat server protocol tcp global 1.1.1.1 8000 inside 192.168.2.9 8000
 nat server protocol tcp global 1.1.1.1 8001 inside 192.168.2.171 8001
 nat server protocol tcp global 1.1.1.1 8001 inside 192.168.2.171 8001
 nat server protocol tcp global 1.1.1.2 www inside 192.168.2.9 www
#
interface GigabitEthernet0/0/1
 speed 100
 duplex full
 description siwang
 ip address 172.16.0.1 255.255.255.0

Fault Analysis

Check whether traffic shaping and rate limiting are configured on the uplink and downlink interfaces of the AR. There are no traffic shaping and rate limiting configurations.

Run the display this interface command in the interface view to check statistics on the physical interface connecting the AR and modem.

The following information shows that there are many packets with CRC errors on the local interface, which may cause the slow PC download.

Input: 1355029 packets, 1393107734 bytes, 1355029 buffers
           4537 broadcasts, 72 multicasts, 0 pauses
           81792 errors, 4660 runts, 0 giants
           77132 crc, 0 align errors, 0 overruns
           0 dribbles, 0 drops, 0 no buffers

Disable auto-negotiation and manually configure the duplex mode and rate. The packets with CRC errors still increase.

Connect the PC to the modem. The download rate is still slow. Check the modem. The indicator of the model flashes abnormally. After the modem is replaced, the download rate is normal.

Suggestion

Use the following troubleshooting methods to locate such a fault:

  • Check whether the indicator of the modem flashes abnormally. If so, replace the modem. Most of such problems can be solved by modem replacement.
  • Check whether traffic shaping and rate limiting are configured on the uplink or downlink interface of the AR. If traffic shaping and rate limiting are configured on the uplink or downlink interface, delete the traffic shaping and rate limiting configuration.
  • Run the display this interface command to check statistics on the physical interface connecting the AR and modem. Check whether there are statistics on packets with CRC errors. If there are statistics on packets with CRC errors, disable auto-negotiation and manually configure the duplex mode and rate.
  • If PPPoE dialup is used on the AR, run the tcp adjust 1200 command on the dialer interface.
  • If the fault persists, directly connect the PC to the model and check whether download is normal. Then determine whether rate limiting is configured on the firewall.
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Updated: 2019-08-09

Document ID: EDOC1000079719

Views: 498525

Downloads: 4547

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