Modify MIB file for SNMP monitoring

Installing and Using OpenWrt
1

I develop a new router with openwrt and I want to modify or create my own MIB file for SNMP manager monitoring

I already instal snmpd in my router and I can execute snmpwalk by console using Putty by SSH conection

''''snmpwalk -v2c -c public localhost
SNMPv2-MIB::sysDescr.0 = STRING: Linux Nestor742023 5.4.164 #0 SMP PREEMPT Tue Jun 14 09:13:25 2022 armv7l
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (5166) 0:00:51.66
SNMPv2-MIB::sysContact.0 = STRING: nestor.martinez@detecmx.com
SNMPv2-MIB::sysName.0 = STRING: DETEC DRQ-100 TEST
SNMPv2-MIB::sysLocation.0 = STRING: Laboratorio''''

but when I want to use Paesler SNMP Tester also conected by ethernet same that Putty send me an error

(SNMP error # -2003) this means that is unreacheable

My question is how can I resolve this error and how can I modify MIB file to add OID related to modem conection

2

You did not provide enough information.

PuTTY?

Your commands above tested SNMP from localhost. You should explain if your server is connected to LAN or WAN. Also, your firewall details.

3

I am connecting my laptop with ethernet cable LAN and access to the router by ethernet cable using Putty I can connect by ssh to port 22 and enter the console of the router

iptables -L -n -v

Show

Chain zone_wan_input (2 references)
pkts bytes target prot opt in out source destination
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0 udp dpt:161

4

What about LAN?

5

Chain zone_lan_input (2 references)
pkts bytes target prot opt in out source destination
0 0 input_lan_rule all -- * * 0.0.0.0/0 0.0.0.0/0 /* !fw3: Custom lan input rule chain /
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate DNAT / !fw3: Accept port redirections /
0 0 zone_lan_src_ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 / !fw3 */