i use net-snmp-5.2.1. i found follwing lines in file "snmp_api.h":
struct snmp_session {
/*
* Protocol-version independent fields
*/
/** snmp version */
long version;
/** Number of retries before timeout. */
int retries;
/** Number of uS until first timeout, then exponential backoff */
long timeout;
...
it seems that timeout will exponentially backoff, but when i snoop the
packets of timeout snmpget,it seems it's not the case:
snmpget -v1 -cwrongcomm 192.168.0.155 sysName.0
snoop -ta 'port 161 and 192.168.0.155'
the packets snooped:
17:31:13.34230 192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:14.35042 192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:15.36033 192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:16.37032 192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:17.38036 192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:18.39037 192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
it retried the default 5 times, and the each interval is almost the default
1 second.
timeout really exponentially backoff ?
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