Ubuntu Proxy Bypass Hosts Configuration

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Setting Multiple Hosts in Ubuntu’s Manual Proxy Settings

In Ubuntu’s manual proxy configuration (found under Settings > Network > Network Proxy > Manual), the “Ignore hosts” field allows you to specify a semicolon-separated list of hosts, domains, or IP ranges to bypass the proxy. This is commonly used for local traffic like localhost or internal networks. You can’t set these as the proxy server address (which expects a single host:port), but they fit perfectly in “Ignore hosts.”

Steps to Configure via GUI:

Open Settings (search for it in the Activities overview).
Go to Network > Network Proxy.
Set the method to Manual.
In the Ignore hosts field, enter your list separated by semicolons (no spaces around them):
```
localhost;127.0.0.1;192.168.1.1;192.168.2.1;::1
```
- localhost: Resolves to loopback addresses.
- 127.0.0.1: IPv4 loopback.
- 192.168.1.1 and 192.168.2.1: Specific local IPs (add as many as needed).
- ::1: IPv6 loopback.
Click Apply to save. This applies system-wide (affects apps like browsers, apt, etc.).

Using Wildcards like `192.168.1.*`:

Direct wildcards (e.g., 192.168.1.*) are not supported in the “Ignore hosts” field—it’s designed for exact hosts, domain suffixes (e.g., *.local), or CIDR notation for IP ranges.
Instead, use CIDR notation for ranges:
- For 192.168.1.* (all IPs in the 192.168.1.0/24 subnet), use 192.168.1.0/24.
- Example updated list:
```
localhost;127.0.0.1;::1;192.168.1.0/24;192.168.2.1
```
- For broader local networks, add 10.0.0.0/8;172.16.0.0/12;192.168.0.0/16 (common private ranges).

Command-Line Alternative (for Scripting or Precision):

If you prefer terminal (or need to automate), use gsettings (modern Ubuntu) or edit /etc/environment for system-wide:

View current ignore list:

gsettings get org.gnome.system.proxy ignore-hosts

Set the list (replace with your values):

gsettings set org.gnome.system.proxy ignore-hosts "['localhost', '127.0.0.1', '::1', '192.168.1.0/24', '192.168.2.1']"

For permanent env var (affects some apps): Add to /etc/environment:
```
no_proxy="localhost,127.0.0.1,::1,192.168.1.0/24,192.168.2.1"
```
Then reboot or run source /etc/environment.

Test by pinging a listed host or checking proxy behavior in a browser. If issues arise (e.g., with specific apps), the env var method often covers more ground.

Setting up proxy to ignore all local addresses
How to Configure Proxy Settings on Ubuntu
Set a network range in the no_proxy environment variable

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