It seems that it only occurs when checking a mib instance of type "Ip
Address". Is it because i'm using SNMPv1 maybe ?
Begin forwarded message:
From: Alef Veld <[EMAIL PROTECTED]>
Date: December 10, 2006 10:53:25 PM GMT+01:00
To: Net-Snmp- Subagent <net-snmp-coders@lists.sourceforge.net>
Subject: followup: snmpget: Error building ASN.1 representation
Strange phenomena. I checked if it might work with the OID instead,
so i did:
root# snmpwalk -On -v 2c -c public localhost ipAdEntNetMask
.1.3.6.1.2.1.4.20.1.3.10.0.0.151 = IpAddress: 255.255.255.0
.1.3.6.1.2.1.4.20.1.3.127.0.0.1 = IpAddress: 255.0.0.0
So i got the OID alright. I put that in the oid string instead, and
what do i get as output?
IP-MIB::ipForwarding.0 = INTEGER: notForwarding(2)
IP-MIB::ipForwarding.0 = INTEGER: notForwarding(2)
Instead of getting the .1.3.6.1.2.1.4.20.1.3 OID, it gets the
ipforwarding OID again, which, as you can see below, is really
different. I can only guess that it 'autocompletes' the OID and
gets the nearest OID that matches. After all both ipforwarding and
ipAdEntNetMask belong to the same IP-MIB. I can do a snmpwalk with
just ipFor as value as well, works just as good.
In any case, i find it strange that it does not work for the string
(ipAdEntNetMask) although a full snmpwalk does tell me it's there,
and that it does respond to the OID but doesn't get the right value
(which hints at me that the ipAdEntNetMask isn't there?)
I hope i'm still making sense :-)
root# snmpwalk -On -v 2c -c public localhost ipForwarding .
1.3.6.1.2.1.4.1.0 = INTEGER: notForwarding(2)
Begin forwarded message:
From: Alef Veld <[EMAIL PROTECTED]>
Date: December 10, 2006 3:45:39 PM GMT+01:00
To: Net-Snmp- Subagent <net-snmp-coders@lists.sourceforge.net>
Subject: snmpget: Error building ASN.1 representation
Can anyone tell me why i get :
snmpget: Error building ASN.1 representation
upon running the following code? I just added an extra OID to
query by using snprintf to fill a variable with the OID and the
ipaddress. Is the buffer to big ? MAX_MSG=256
GLvoid snmp_walk(char *ip_addr)
{
struct snmp_session session, *ss;
struct snmp_pdu *pdu;
struct snmp_pdu *response;
struct hostent *he;
oid anOID[MAX_OID_LEN];
size_t anOID_len = MAX_OID_LEN;
struct variable_list *vars;
int status;
int count=1;
char *oids[OIDS];
/* For variable OID instances */
char varbla_buffer[MAX_MSG];
database *data;
int i;
/* SNMPv2-MIB */
oids[0]="sysDescr.0";
oids[1]="sysUpTime.0";
oids[2]="sysContact.0";
oids[3]="sysName.0";
oids[4]="sysLocation.0";
/* IP-MIB */
oids[5]="ipForwarding.0";
snprintf(varbla_buffer,sizeof(varbla_buffer),"ipAdEntNetMask.%
s",ip_addr);
fprintf(stderr,"varbuffer: %s lenght: %d\n",varbla_buffer,strlen
(varbla_buffer));
oids[6]=varbla_buffer;
/* IF-MIB */
oids[7]="ifNumber.0";
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