> > > > # invalid IP
> > > >
> > > > TLDR 10.241.0.0/16  is technically not a valid host IP but it has
> > > obviously worked in the past.

Just following this up, kmacy@'s recent commits resolved this - thanks!

Finally, I came up with this, as a way of keeping the "symmetry" of the
0.0 and still if I read the RFC correctly, have a valid host IP:

# jail networks
cloned_interfaces="${cloned_interfaces} lo1"
ifconfig_lo1="inet 10.241.0.0/15" --- should be a host mask x.1.0.0
ifconfig_lo1_aliases="inet 10.241.0.1-15/32"

# ifconfig lo1

lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128 tentative 
        inet 10.241.0.0 netmask 0xfffe0000 
        inet 10.241.0.1 netmask 0xffffffff 
        inet 10.241.0.2 netmask 0xffffffff 
        inet 10.241.0.3 netmask 0xffffffff 
        inet 10.241.0.4 netmask 0xffffffff 
        inet 10.241.0.5 netmask 0xffffffff 
        inet 10.241.0.6 netmask 0xffffffff 
...

thanks everybody for the patches and the insight.

FWIW the alternative (original breaking config) also works again:
# jail networks
cloned_interfaces="${cloned_interfaces} lo1"
ifconfig_lo1_aliases="inet 10.241.0.1-15/15"


A+
Dave
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