Synaccess Networks NP-0801DTM - Manual (Page 255)

ENHANCED IP STACK EXTENSIONAT COMMANDS
255 HSPA+ AT Commands Reference Guide
Syntax
Command Command type
AT#CACHEDNS=[<mode>] Set
AT#CACHEDNS? Read
AT#CACHEDNS=? Test
Parameters and Values
<mode>
0 Caching disabled or clear current cache.
1 Caching enabled.
Notes
„
The validity period of each cached entry—that is, how long a DNS response remains valid—is determined by a
value called the Time To Live (TTL), set by the administrator of the DNS server handing out the response.
„
If the cache is full (8 elements) and a new IP address is resolved, an element is deleted from the cache. The
deleted element is the one not used for the longest time.
„
It is recommended that you clean the cache, if command +CCLK is issued while the DNS Response Caching was
enabled.
Manual DNS Selection #DNS
Set command allows to manually set primary and secondary DNS servers either for a PDP context defined by
+CGDCONT or for a GSM context defined by #GSMCONT.
Read command returns the manual DNS servers set either for every defined PDP context and for the single GSM
context (only if defined), in the format:
[#DNS: <cid>,<primary>,<secondary>[<CR><LF>
#DNS: <cid>,<primary>,<secondary>]]
Test command reports the supported range of values for the <cid> parameter only, in the format:
#DNS: (0,5),,
Syntax
Command Command type
AT#DNS=<cid>,<primary>,<secondary> Set
AT#DNS? Read
AT#DNS=? Test
Parameters and Values
<cid> Context identifier.
0 Specifies the GSM context.
1‐5 Numeric parameter that specifies a particular PDP context definition.
<primary> String type, manual primary DNS server, in the format “xxx.xxx.xxx.xxx” used for