Rails shows IP as 127.0.0.1 when accessed from private NIC, but Nginx shows the correct IP. Public IP gets forwarded fine
The issue was that Rails thinks any 192.168.x.x address is a private address, so strips them from the X-Forwarded_For header.
# IP addresses that are "trusted proxies" that can be stripped from# the comma-delimited list in the X-Forwarded-For header. See also:# http://en.wikipedia.org/wiki/Private_network#Private_IPv4_address_spacesTRUSTED_PROXIES = %r{ ^127\.0\.0\.1$ | # localhost ^(10 | # private IP 10.x.x.x 172\.(1[6-9]|2[0-9]|3[0-1]) | # private IP in the range 172.16.0.0 .. 172.31.255.255 192\.168 # private IP 192.168.x.x )\.}xSee the relevant Rails source here and here.
One solution is to add this to your config/application.rb:
config.action_dispatch.trusted_proxies = /^127\.0\.0\.1$/ # localhostThat way, IPs on your local network will not be replaced by '127.0.0.1'.