How to redirect all traffic except certain IPs?

To redirect all traffic except for certain IPs, one common approach involves configuring firewall rules or using web server configurations. Below is a step-by-step guide on how to achieve this using both methods.

Using Firewall Rules

Step 1: Identify the Traffic to be Redirected
First, identify the traffic that you want to redirect. You should know the source IP addresses that you want to whitelist (i.e., the IPs that should not be redirected).

Step 2: Configure Firewall Rules
You can use a tool like `iptables` on Linux to achieve this. Here’s how you can do it:

1. Allow Traffic from Certain IPs: \`\`\`bash iptables -A INPUT -s -j ACCEPT iptables -A INPUT -s -j ACCEPT \`\`\`

Replace `` and `` with the actual IP addresses you want to whitelist.

1. Redirect Other Traffic: \`\`\`bash iptables -A INPUT -j REDIRECT —to-ports \`\`\`

Replace `` with the port you want to redirect traffic to.

Example:
```

Allow traffic from 192.168.1.100 and 192.168.1.101
iptables -A INPUT -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -s 192.168.1.101 -j ACCEPT

Redirect other traffic to port 8080
iptables -A INPUT -j REDIRECT —to-ports 8080
```

Using Web Server Configuration (e.g., Apache or NGINX)

Apache Configuration

1. Open the Configuration File: Locate the Apache configuration file, usually `httpd.conf` or a virtual host configuration file.

1. Whitelist Certain IPs: Use the `` directive to allow only certain IPs.

\`\`\`apache Require ip 192.168.1.100 192.168.1.101 \`\`\`

1. Redirect All Other Traffic: Use `RewriteRule` to redirect other traffic.

\`\`\`apache RewriteEngine On RewriteCond %{REMOTE\_ADDR} !^192.168.1.100 RewriteCond %{REMOTE\_ADDR} !^192.168.1.101 RewriteRule ^(.\*)$ http://othersite.com$1 [R=301,L] \`\`\`

Example:
```
Require ip 192.168.1.100 192.168.1.101

RewriteEngine On RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.100 RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.101 RewriteRule ^(.*)$ http://othersite.com$1 [R=301,L]

```

NGINX Configuration

1. Open the Configuration File: Open the NGINX configuration file, usually `nginx.conf` or a server block configuration file.

1. Whitelist Certain IPs: Use the `allow` directive to allow only certain IPs.

\`\`\`nginx location / { allow 192.168.1.100; allow 192.168.1.101; deny all; } \`\`\`

1. Redirect All Other Traffic: Use `return` directive to redirect other traffic.

\`\`\`nginx location / { allow 192.168.1.100; allow 192.168.1.101; deny all; return 301 http://othersite.com; } \`\`\`

Example:
```
server { listen 80; server_name mysite.com;

location / { allow 192.168.1.100; allow 192.168.1.101; deny all; return 301 http://othersite.com; } } ```

Reliable Sources

1. iptables Manual Page: [iptables(8)](https://man7.org/linux/man-pages/man8/iptables.8.html)

1. Apache Directives Documentation: [Apache mod_rewrite](https://httpd.apache.org/docs/current/mod/mod_rewrite.html)

1. NGINX Documentation: [NGINX HttpCoreModule](http://nginx.org/en/docs/http/ngx_http_core_module.html)

These steps should help you redirect traffic while allowing exceptions for specific IP addresses. The configuration might vary slightly depending on your specific requirements and the environment in which you’re operating.