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I want to use it for testing SNMP on top of IPV6.

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For IPv6 SNMP testing the most reliable free route is the Net‑SNMP command line: it explicitly supports IPv6 transports and lets you exercise SNMPv1/v2c and SNMPv3 without worrying whether a particular GUI understands IPv6. As noted, GUI MIB browsers exist, but the CLI removes one layer of “does the tool handle IPv6?” when you just want to prove reachability and OID access. See the Net‑SNMP project for downloads and docs: Net-SNMP.

Example commands (replace addresses/credentials):

snmpwalk -v2c -c public udp6:[2001:db8::1]:161 .1.3.6.1.2.1.1
snmpwalk -v3 -l authPriv -u myuser -a MD5 -A authpass -x AES -X privpass udp6:[2001:db8::1]:161 .1.3.6.1.2.1.1
snmpwalk -v2c -c public 'udp6:[fe80::abcd%eth0]:161' .1.3.6.1.2.1.1

Key notes and troubleshooting:

  • Use the udp6: transport prefix. For link‑local addresses include the scope id (%eth0) and quote/bracket the whole transport string if the shell interprets %.
  • Verify the agent is listening on IPv6 (look for udp6 entries with ss/netstat) and open UDP/161 in IPv6 firewall rules (ip6tables, Windows firewall).
  • SNMPv1/v2c send community strings in clear text; prefer SNMPv3 (-v3 -l authPriv) for secure testing.
  • If you try a Java GUI MIB browser and it fails to reach IPv6 hosts, start the JVM with -Djava.net.preferIPv6Addresses=true (or ensure it’s not forced to the IPv4 stack).
  • Capture traffic with tcpdump/Wireshark to confirm packets: tcpdump -n -i eth0 ip6 and udp port 161.

If a GUI is required, pick one that explicitly states IPv6 support; otherwise use Net‑SNMP CLI to validate the agent first, then move to a GUI once IPv6 connectivity is proven.

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