Docker-compose service with traefik and internal network - docker-compose

Question

I want to use both internal and an external traefik network in my container.
Problem: when I define an internal network, traefik loses communication with my service.
traefik_webgateway internal network
+----------+ +--------------------------+
| traefik | | +------+ +-----+ |
| +--------------+ | app | | api | |
| | | | | +------+ +-----+ |
| | | proxy | | |
| | | | | +-----+ +------+ |
| | | | | |auth | |worker| |
| +--------------+ +-----+ +------+ |
| | | |
+----------+ +--------------------------+
docker-compose.traefik.yml:
services:
traefik:
image: traefik:v2.4
restart: unless-stopped
ports:
- 80:80
- 8080:8080
- 443:443
networks:
- webgateway
networks:
webgateway:
driver: bridge
docker-compose.yml:
services:
proxy:
networks:
- internal # <=== this causes traefik point the healthcheck to the 172 IP instead of the 192 IP (see Edit below)
- traefik
labels:
- traefik.http....
app:
networks:
- internal
api:
networks:
- internal
auth:
networks:
- internal
worker:
networks:
- internal
networks:
internal:
traefik:
external:
name: traefik_webgateway
I don't want my services to use the external traefik network because I want my services to be namespaced for my green/blue deployment.
I was wondering why this is happening and if there's a solution.
Thanks in advance!
EDIT:
I obtained the proxy container's network:
docker inspect -f '{{range.NetworkSettings.Networks}} {{.IPAddress}}{{end}}' <container id>
And received 2 IPS:
172.18.A.A 192.168.B.B
I have a healthcheck that pings /health. On the traefik dashboard:
http://172.18.A.A:8000
Traefik is unable to communicate with this IP. Sometimes it's able to when it picks the other IP: 192.168.B.B.
From within the proxy container, I'm able to ping proxy (it uses the "B" IP)
PING proxy (192.168.B.B): 56 data bytes
64 bytes from 192.168.16.4: seq=0 ttl=64 time=0.090 ms
64 bytes from 192.168.16.4: seq=1 ttl=64 time=0.080 ms
64 bytes from 192.168.16.4: seq=2 ttl=64 time=0.065 ms
64 bytes from 192.168.16.4: seq=3 ttl=64 time=0.069 ms
I am able to ping: ping 192.168.B.B
I am unable to ping: ping 172.18.A.A