inadyn is a process that runs on the rimup DSM periodically to update the dynamic dns entry for isfs1.dyndns.org. The idea is that it will set the dns entry to the address of the verizon modem on the cradlepoint router. However, the default gateway on that DSM was set to 192.168.0.1, which is the router for the hughes satellite.
As a result, the IP address for isfs1.dyndns.org was being set to the WAN IP address of the Hughes directway from time to time.
I changed the default gateway on that DSM to 192.168.0.5, which is the cradlepoint router.
Also, nearup was also running inadyn to update the DYNDNS entry, which it shouldn't.
So now, the address for isfs1.dyndns.org should now consistently be the Verizon modem address.