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A Simple bash script to modify macOS DNS by detecting SSID
- Hank
- 16 Jul, 2024
I believe most of us have different DNS settings for different networks. For example, in my case, I use Google's public DNS `8.8.8.8` and Cloudflare's `1.1.1.1` at home, but at work, I have to clearthe DNS reacord and let my Mac use the default DNS provided by the company.It's a bit annoying to change the DNS settings manually every time I switch networks. So I wrote a simple bash script to automatically change the DNS settings based on the SSID of the network I'm connected to.Here is the script:```bash #!/bin/bash # clear or set dns function set_or_clear_dns() { local current_ssid=$(networksetup -getairportnetwork en0 | cut -d ':' -f 2 | xargs) if [[ "$current_ssid" == "YOUR_COMPANY_WIFI_SSID" ]]; then # Clear DNS to Automatic (Empty) sudo networksetup -setdnsservers Wi-Fi empty else # Set DNS to 1.1.1.1 and 8.8.8.8 sudo networksetup -setdnsservers Wi-Fi 1.1.1.1 8.8.8.8 fi } set_or_clear_dns ```You can replace `YOUR_COMPANY_WIFI_SSID` with your company's Wi-Fi SSID. Ofcause, you can add more SSID conditions and DNS settings as needed. And in the code I just simply clear the DNS settings to automatic when connected to the company's Wi-Fi, you can also set it to other DNS servers, by replacing `empty` with the DNS servers you want to use.
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