Squid - select loopback interface or not?
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 I ask u this. U have a network in the range 192.168.1.0/24, u setup pfsense with 2 interfaces, WAN+LAN. Them u decide to install squid, u want to protect the network behind the LAN, in this situation u need the loopback? In my little experience, I just need loopback went I need to get squid internal performance info which mgr give us, other than that no need loopback. Hope this give u some info. 
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 I ask u this. U have a network in the range 192.168.1.0/24, u setup pfsense with 2 interfaces, WAN+LAN. Them u decide to install squid, u want to protect the network behind the LAN, in this situation u need the loopback? In my little experience, I just need loopback went I need to get squid internal performance info which mgr give us, other than that no need loopback. Hope this give u some info. I have three lan Interfaces. I hope I understood you correctly, and so I disabled the loopback interface now. I found this on the pfsense page 
 https://doc.pfsense.org/index.php/Setup_Squid_as_a_Transparent_ProxyOr does anyone disagree turning off the loopback interface? 
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 IIRC you need the loopback interface selected for Lightsquid to work. 
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 @KOM: IIRC you need the loopback interface selected for Lightsquid to work. ok only for lightsquid. And if i wanna use squidguard….Do i have to turn loopback device also on ? 
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 Not sure. I'd just leave loopback selected unless it's giving you some specific problem. 
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 @KOM: Not sure. I'd just leave loopback selected unless it's giving you some specific problem. Ok. Thx. Is loopback necessary for clam (antivirus) ? 
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 Definitely no idea. I don't run that crap on my router. AV belongs on the client, not the router. 
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 Thx KOM….you helped me and a lot of other users in this forum. :-) 
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 I found a difference when I activate loopback interface in proxy mode. if the loopback interface is activated, advertising links on google search results won´t open. thats great! 
 if i deactivate the loopback interface, advertising links on google search results open again..can someone explain why it is like that? thx 
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 Perhaps the loopback interface is used by squidguard? 
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 no 
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 It's now a week later and you're still worrying about this? Stuff works when it's selected, stuff breaks when it isn't. Just leave it selected. 

