I'm writing because i have a very strange issue with a newly installed debian 9.5 server. This server is behind a NAT made with a SonicWall firewall that assigns a public dedicated address to this server.
The internal IP address of the debian server is 192.168.50.45 and the firewall NATs this IP address to 93.xx.xx.220, but I see that the server's IP address gets translated to the default address (93.xx.xx.196) instead. So I assigned the private IP address 192.168.50.45 to another machine and this successfully gets translated to 93.xx.xx.220 on the firewall.
I've checked for env variables like http_proxy, https_proxy, checked for some kind of iptables rule that redirects traffic to the internal proxy, but I've found nothing. Does anyone have other suggestions on what can i check? Thanks in advance