Troubleshooting; Troubleshooting Cases - 3Com MSR 50 Series Configuration Manual

208 C 6: DCC C
HAPTER

Troubleshooting

Troubleshooting Cases

ONFIGURATION
[RouterD-Serial2/0:15] ip address 100.1.1.254 255.255.255.0
# Configure PPP encapsulation and other PPP parameters on the serial interface.
[RouterD-Serial2/0:15] link-protocol ppp
[RouterD-Serial2/0:15] ppp authentication-mode chap
[RouterD-Serial2/0:15] ppp chap user userd
[RouterD-Serial2/0:15] remote address pool 1
[RouterD-Serial2/0:15] quit
# Configure an IP address pool for assigning addresses to PPP users.
[RouterD] domain system
[RouterD-isp-system] ip pool 1 100.1.1.1 100.1.1.16
[RouterD-isp-system] quit
This section covers these topics:
"Troubleshooting Cases" on page 208
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Symptom 1:
DCC dialup connection cannot be set up because the modem does not dial when
the router forwards data.
Solution:
Check that:
The modem and phone cable connections are correct, and the modem
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initialization process is correct.
The dial interface, if it is synchronous/asynchronous, is set to work in
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asynchronous protocol mode.
DCC is enabled on the dial interface.
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A dialer route or dialer number command is available for the packets.
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Symptom 2:
The remote end cannot be pinged after the modem is connected.
Solution:
Check that:
The same link layer encapsulation is adopted at the two ends, and correct PPP
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parameters are configured for authentication. You may use the debugging
ppp all command to verify that.
Correct IP address is assigned to the dial interface (physical or dialer).
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DCC is enabled on the dial interface.
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The correct dialer-group and dialer-rule commands are configured and
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associated to ensure that the packets can pass.