configuração do mrtg

instalei ele bonitinho... sem erro nenhum... mas na hora q dei esse comando pra configurar:

Citação:

./cfgmaker --global 'WorkDir: /var/www/mrtg' --global 'Options[_]: bits,growright' --global 'RunAsDaemon:Yes' --output /home/sady/mrtg-2.11.1/mrtg.cfg 129.13.145.160

ele da essas msg:

Citação:

--base: Get Device Info on [email protected]:
SNMP Error:
no response received
SNMPv1_Session (remote host: "129.13.145.160" [129.13.145.160].161)
community: "public"
request ID: -1028107200
PDU bufsize: 8000 bytes
timeout: 2s
retries: 5
backoff: 1)
at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_util.pm line 627
SNMPWALK Problem for 1.3.6.1.2.1.1 on [email protected]::::::v4only
at ./cfgmaker line 796
WARNING: Skipping [email protected]: as no info could be retrieved

--base: Writing /home/sady/mrtg-2.11.1/mrtg.cfg

o q ta dando de errado?