obtaining external ip address from docker container

Anonymous

TRIALOP

2 years ago

I have deployed my app using docker on Railway, my app takes the external ip address from the requests it gets and needs to save them to a database. However when saving the address it's a private IP address and that's not what i want

Solved

26 Replies

maddsua

HOBBY

2 years ago

Check "x-envoy-external-address" request header for it

Anonymous

TRIALOP

2 years ago

okay

Anonymous

TRIALOP

2 years ago

i'll try that one

brody

EMPLOYEE

2 years ago

nope

maddsua

HOBBY

2 years ago

what nope lol

maddsua

HOBBY

2 years ago

that's what railway's proxy sets

brody

EMPLOYEE

2 years ago

not for long

brody

EMPLOYEE

2 years ago

please see the "request headers" section of this docs page

https://docs.railway.app/reference/public-networking

Status changed to Solved Railway • about 2 years ago

maddsua

HOBBY

2 years ago

some of those were spoofable, weren't they?

brody

EMPLOYEE

2 years ago

read the right most value

brody

EMPLOYEE

2 years ago

railway is not going to be using envoy forever

maddsua

HOBBY

2 years ago

ok, true, but there was a problem with clients being able to just set arbitrary value to X-Forwarded-For

brody

EMPLOYEE

2 years ago

maddsua

HOBBY

2 years ago

I didn't see any updates that it was fixed

maddsua

HOBBY

2 years ago

bruh

maddsua

HOBBY

2 years ago

it should be overwritten, not appended

maddsua

HOBBY

2 years ago

anyway, I'm out then

Anonymous

TRIALOP

2 years ago

so uh

Anonymous

TRIALOP

2 years ago

it can be spoofed

brody

EMPLOYEE

2 years ago

Anonymous

TRIALOP

2 years ago

i'd say the right one is X-Forwarded-For

Anonymous

TRIALOP

2 years ago

i just need the remote ip

brody

EMPLOYEE

2 years ago

read the right most value from that header and you will get the remote ip

Anonymous

TRIALOP

2 years ago

ok thanks

Anonymous

TRIALOP

2 years ago

it works, thank you

brody

EMPLOYEE

2 years ago

no problem