gateway template should replace bosh declared gateway, not just add.

[poblin-orange]

Hello,
im trying to use this bosh release to enable access to an internet gateway from a bosh deployment.
The context :

• single NIC eth0, bosh networks declares gateway 10.234.228.129
• add the gateway template to specify default gateway to my internet gateway 10.234.228.130
• add route template, so that intranet access (10.0.0.0 ..) are routed to the bosh declared gateway
• the release im using is docker-boshrelease.

After deployment, i see 2 defaults gateways declared. Seems strange ?

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.234.228.130 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 10.234.228.129 0.0.0.0 UG 0 0 0 eth0
10.0.0.0 10.234.228.129 255.255.255.192 UG 0 0 0 eth0
10.234.228.128 0.0.0.0 255.255.255.192 U 0 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0

It prevents the internet access. Removing the initial default gateway fixes the issue (see gist below)

https://gist.github.com/poblin-orange/5ac277854a24b4a35966

[frodenas]

The gateway job only allows to add new gateways, but never deletes the existing ones. I mainly used this job on an IaaS that didn't have a default gateway.

Glad to accept a PR that deletes existing ones.

[voelzmo]

Not sure if this is feasible, though. The agent will write the network settings on a regular basis and therefore re-add the gateway if you delete it.