Does Squid cache DNS?

Does Squid cache DNS?

Squid must use non-blocking I/O at all times, so DNS lookups are implemented external to the main process. The dnsserver processes do not cache DNS lookups, that is implemented inside the squid process.

What is Squid DNS?

Squid is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching web, DNS and other computer network lookups for a group of people sharing network resources, and aiding security by filtering traffic.

Can Squid cache HTTPS?

Squid can pass arbitrary TCP traffic, such as SSL, using the CONNECT directive, but it cannot cache the content in any way. So the answer to your original question is simply no. You cannot cache web content for SSL connections as those as encrypted end-to-end.

How do I enable HTTPS on Squid proxy?

in the Squid service:

1. Make sure that the utilized Squid service supports the necessary options.
2. Go to the Squid service folder.
3. Create a self-signed SSL certificate.
4. Please fill in the fields of the self-signed SSL certificate.
5. Create a trusted certificate to be imported into a browser.
6. Import the squid.

What is SSL bump in Squid?

SSL Bumping. Squid service that is used for intercepting the content of encrypted HTTPS sessions. in the Squid service to handle encrypted connections. If SSL Bumping is not configured, the proxy server cannot intervene in the process of establishing an encrypted connection.

Can HTTPS be cached?

No, it’s not possible to cache https directly. The whole communication between the client and the server is encrypted. A proxy sits between the server and the client, in order to cache it, you need to be able to read it, ie decrypt the encryption. You can do something to cache it.

What is SSL bump Squid?

What is the purpose of the dnsserver in squid?

The dnsserver is a process forked by squid to resolve IP addresses from domain names. Squid must use non-blocking I/O at all times, so DNS lookups are implemented external to the main process. An internal DNS client was integrated into the main Squid binary in Squid-2.3.

Which is DNS port does Squid proxy use?

DNS is not HTTP. It uses UDP port 53, and will make queries in a totally different protocol to that which a web proxy can understand, so unless you have some non-squid way of getting DNS queries through the system running the squid proxy, you will get exactly what you are seeing.

How are DNS lookups implemented in the squid binary?

Squid must use non-blocking I/O at all times, so DNS lookups are implemented external to the main process. The dnsserver processes do not cache DNS lookups, that is implemented inside the squid process. An internal DNS client was integrated into the main Squid binary in Squid-2.3.

Why does squid use non-blocking I / O?

This is necessary because the gethostbyname (3) function blocks the calling process until the DNS query is completed. Squid must use non-blocking I/O at all times, so DNS lookups are implemented external to the main process. The dnsserver processes do not cache DNS lookups, that is implemented inside the squid process.