Test TC_pdp6_act_deact_pcodns checks the 2 DNS values against matched
configuration. If osmo-ggsn.cfg doesn't have a 2nd DNS configured, it
won't sent the related PCO in the response, and the test will fail.
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.
Pau Espin
Harald Welte