Nortel Networks 4050 User Manual
Chapter 10 Configuring system settings 533
Nortel Secure Network Access Switch 4050 User Guide
2
Enter the DNS Client information in the applicable fields.
describes
the DNS Client Settings fields.
3
Click Apply on the toolbar to send the current changes to the Nortel
SNAS 4050. Click Commit on the toolbar to save the changes permanently.
SNAS 4050. Click Commit on the toolbar to save the changes permanently.
Table 107
DNS Client Settings fields
Field
Description
Cache size
Specifies the maximum number of DNS entries contained
in the local DNS cache. The range is 0–10000. The default
is 1000.
in the local DNS cache. The range is 0–10000. The default
is 1000.
Retransmit Interval
Specifies the interval for retransmitting a DNS query in
seconds (
seconds (
s
), minutes (
m
), or hours (
h
). If you do not specify
a measurement unit, seconds is assumed. The default is 2
(2 seconds).
(2 seconds).
Retransmit Counter
Specifies the maximum number of times a DNS query is
retransmitted. The default is 3.
retransmitted. The default is 3.
Max TTL
Specifies the maximum Time-to-live(TTL) value for entries
in the DNS cache. After the TTL has expired, the entries
are discarded. Specify the TTL in seconds (s), minutes (
in the DNS cache. After the TTL has expired, the entries
are discarded. Specify the TTL in seconds (s), minutes (
m
),
hours (
h
), or days (d). You can enter compound values (for
example, 2h30m). If you do not specify a measurement
unit, seconds is assumed. The default is 3h (3 hours).
unit, seconds is assumed. The default is 3h (3 hours).
Health Check
Specifies the interval for the Nortel SNAS 4050 to check
the health of the DNS servers. At the specified interval, the
Nortel SNAS 4050 performs a DNS query to each DNS
server in the system configuration to determine its health
status. Specify the interval in seconds (
the health of the DNS servers. At the specified interval, the
Nortel SNAS 4050 performs a DNS query to each DNS
server in the system configuration to determine its health
status. Specify the interval in seconds (
s
), minutes (
m
), or
hours (
h
). If you do not specify a measurement unit,
seconds is assumed. The default is 10 (10 seconds).
Health Check Down Counter Specifies the number of times a DNS server health check
can time out before the Nortel SNAS 4050 determines the
DNS server is down. The default is 2.
DNS server is down. The default is 2.
Health Check Up Counter
Specifies the number of times a DNS server health check
returns a positive response before the Nortel SNAS 4050
determines the DNS server is up. The default is 2.
returns a positive response before the Nortel SNAS 4050
determines the DNS server is up. The default is 2.