Allied Telesis AR400 Series Router - Manual (Page 48)

48 AR400 Series Router User Guide
Software Release 2.6.1
C613-02021-00 REV D
IP Addresses and DHCP
Problem You have selected Quick Start > WAN > DHCP, but the router hasn’t been
given an IP address.
Solution ■ Check that the router’s domain and host name are correct (Configuration >
System > General).
■ Check that the DHCP server can reach the router, by pinging the router
from the DHCP server. Note that you will not get a response if Respond to
ping
is unchecked on the Firewall Policy Options page (Configuration >
Firewall > Interfaces > Policy options tab). This option is checked by
default.
Problem The router is enabled as a DHCP server, but cannot assign an IP address to a
host.
Solution ■ Reboot the host machine.
■ Check the host’s TCP/IP settings, to make sure that the host is set to obtain
its IP address dynamically:
In Windows 95/98, click Settings > Control Panel > Network. Select TCP/
IP and click Properties. Click Obtain an IP address automatically.
In Windows 2000, click Settings > Control Panel > Network and Dial-up
Connections > Local Area Connection > Properties. Select Internet
connection (TCP/IP) and click Properties. Click Obtain an IP address
automatically
.
■ Check that the DHCP server has a large enough range of addresses
(Configuration > DHCP Server).
■ Check that the router’s link to the LAN is functioning, by checking the
interface status (Monitoring) and that the link LED is lit (see “Traffic Flow
and Network Address Translation (NAT)” on page 45).
Traffic Logging and Firewall Alert Messages
Problem Firewall Alert messages are not being emailed.
Solution ■ Check that Enable Email Firewall Alerts is checked (Configuration >
Firewall > Events > Alarms tab) and that the email address is correct.
■ Check that the DNS Server IP is correct (Configuration > Internet Protocol
> General).
■ Check that a hostname is correctly specified (Configuration > System >
General).
■ Make sure that the mail server has an account set up for the router.
Problem You are not receiving email notifications of all attacks that the firewall
intercepts.
Solution Your alarm thresholds may be set too high (Configuration > Firewall > Events
> Alarms tab). Be careful when reducing the thresholds, because if the
threshold is too low, your mail service may be flooded.