# Managed by Ansible (roles/signal_api)
#
# Prefer IPv4 over IPv6 in getaddrinfo.
#
# chat.signal.org resolves to AWS Global Accelerator dualstack addresses, and
# DNS returns the AAAA records first. This container has NO IPv6 address at all,
# and this host's IPv6 path is unreliable anyway - the same edge that made
# Google's IPv6 endpoint return a confident 404 for the Go tarball.
#
# signal-cli would connect to the AAAA address, fail, and report
#   Link request error: Connection closed!
# while the phone showed a bare "network error" - a failure with no obvious
# cause on either end.
#
# This line flips the precedence so IPv4-mapped addresses sort first, which is
# the standard glibc fix. It does NOT disable IPv6; it only changes the order.
precedence ::ffff:0:0/96  100