This way the address is reachable for ggsn system and can route the
packet correctly.
This commit fixes runtime failures of
GGSN_Tests.TC_pdp4_act_deact_gtpu_access when running inside the
container, since that test uses the DNS address to attempt a ping and
waits for a response. If the address is non reachable/routable from
osmo-ggsn tun, then the packet is dropped by the kernel and no ping
response is sent back.
Ideally we would want to launch a group of containers with their own
private network segment and use the same static IP addresses in those
isolated networks.
The stupidity of docker is requiring unique IPv4 addresses even on
isolated (!) networks. This means we have to manually give each of our
test setups a different subnet, and then we can at least run one
instance that test in parallel to at most one instance of each other
test.
If this weird reestriction about unique IPv4 addresses didn't exist,
we could start any number of test runs in parallel.
Pau Espin
Harald Welte