Configure snmptrapd for IPv6?

In reading the snmptrapd man page, it refers to the snmpd manpage for configuring it to listen on IPv6 interfaces for traps over IPv6. I see the traps arrive on the interface with tcpdump.

I tried adding the following (one at a time) to snmptrapd.conf and restarting snmptrapd. No errors but traps still aren't processed. The first is a slight mod to what's in example.conf.

snmpTrapdAddr udp:162,udp6:[::1]:162
snmpTrapdAddr udp:162,udp6:[2001:4888:a03:311f:c0:a:0:1f5]:162

I updated net-snmp to the latest version 5.7.2 with no change.

I've also tried adding the args directly in various forms as shown below:

/usr/sbin/snmptrapd -D -Lsd udp:162,udp6:[::]162
./snmptrapd -Lsd udp:162,udp6:162 -p /var/run/snmptrapd.pid
./snmptrapd -Lsd udp,udp6 -p /var/run/snmptrapd.pid
./snmptrapd -Lsd udp6:162 -p /var/run/snmptrapd.pid
./snmptrapd -Lsd -p /var/run/snmptrapd.pid udp6:162
./snmptrapd -Lsd -p /var/run/snmptrapd.pid udp6:162,udp:162
./snmptrapd -Lsd -p /var/run/snmptrapd.pid udp6:162,udp:[::1]:162
./snmptrapd -Lsd -p /var/run/snmptrapd.pid udp:162,udp6:[::1]:162
./snmptrapd -D all -Lsd -p /var/run/snmptrapd.pid udp:162,udp6:[::1]:162 2>&1 > /tmp/snmptrapd.log
./snmptrapd -Lsd -p /var/run/snmptrapd.pid udp:162,udp6:[2001:4888:a03:311f:c0:a:0:1f5]:162
./snmptrapd -Lf /var/log/snmptrapd.new.log -p /var/run/snmptrapd.pid udp:162,udp6:[2001:4888:a03:311f:c0:a:0:1f5]:162
./snmptrapd -Lf /var/log/snmptrapd.new.log -n -M /usr/share/snmp/mibs -p /var/run/snmptrapd.pid udp:162,udp6:[2001:4888:a03:311f:c0:a:0:1f5]:162
./snmptrapd -Lf /var/log/snmptrapd.new.log -n -M /usr/share/snmp/mibs -p /var/run/snmptrapd.pid udp:162,udp6:162

I also compiled a new net-snmp including --enable-ipv6, and it also ignores all IPv6 traps.

./configure --with-mib-modules="mibII/ipv6" --enable-ipv6 --with-sys-contact=root --with-sys-location="Unknown" --with-logfile=/var/log/snmpd.log --with-persistent-directory=/var/net-snmp --with-default-snmp-version=2

Interestingly if I only add udp6:162 and not udp:162, it stops processing v4 traps.

./snmptrapd -Lsd udp6:162 -p /var/run/snmptrapd.pid

Traps can be seen arriving using tcpdump.

So how can snmptrapd be configured to listen for traps over IPv6?

Thanks!

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