I sent this once before, but it seems no one believed it ...
According to the documentation of snmp.conf (not snmpd.conf), it should be
possible
to specify the source address used when sending traps:
clientaddr [<transport-specifier>:]<transport-address>
specifies the source address to be used by command-line applica‐
tions when sending SNMP requests. See snmpcmd(1) for more infor‐
mation about the format of addresses.
This value is also used by snmpd when generating notifications.
This is useful for the case of routing server where official source address is
assigned to one interface (typically loopback device), and we want all traps to
be sent with that source address.
The problem is that setting the clientaddr in snmp.conf has no effect because
it is not being read by the agent. The following 2 line patch against current
net-snmp svn trunk fixes the problem.
--- a/agent/agent_read_config.c 2010-12-14 10:44:20.744120879 -0800
+++ b/agent/agent_read_config.c 2010-12-14 10:44:53.200847830 -0800
@@ -261,6 +261,8 @@ init_agent_read_config(const char *app)
netsnmp_ds_register_config(ASN_INTEGER, app, "maxGetbulkResponses",
NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_MAX_GETBULKRESPONSES);
+ netsnmp_ds_register_config(ASN_OCTET_STR, app, "clientaddr",
+ NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_CLIENT_ADDR);
netsnmp_init_handler_conf();
#include "agent_module_dot_conf.h"
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