Does my router cache DNS?

Is it safe to cache DNS?

/ajax() for its networking functions. My understanding is that the underlying socket requests are using async to make use of multiple threads; and that caching DNS could therefore be dangerous to the system.

Is this correct? If so, how does one disable it? Does one need to specify what DNS servers to use, and what are their DNS addresses? Is there any alternative to disabling DNS caching?ajax is that the URL might be changed by the server, so if you are using it with relative URLs, you need to consider that. This does not have anything to do with DNS and is unrelated to your question.get method () instead.

As for caching DNS, the best way is to always set up the DNS servers in your own systems to always go to your servers and not use any local DNS. You can use the -all switch in Windows to use your computer's OS DNS servers and disable the system's built-in DNS.

Does my router cache DNS?

This is a discussion on ?

Within the Linux Programming forums, part of the Platform Specific Boards category; I am using linux 2.6.13-rt16.8. The issue I have is that I have set up my .

I am using linux 2. The issue I have is that I have set up my /etc/resolv.conf to be:
Nameserver 192.168.0.1

And I don't have any DNS on my network, but when I run a nslookup it tells me that the answer for google.com comes from 192. What am I doing wrong? Is the /etc/resolv.conf file correct?

Re: Does my router cache DNS? I'm not saying your router is "wrong", but if you want to add DNS servers, this is how you do it. The /etc/resolv.conf file contains a block of DNS server addresses, and the nameserver command will tell your system what the DNS server for your LAN is (so that's where the answer is coming from).

You can use the dig command (available in package resolvconf) to query DNS directly, without using the resolv. This should be a good way to test your DNS.

Originally posted by klindbluss I am using linux 2.

Should I turn on local DNS caching?

We're planning on moving our DNS server onto a different computer.

On the box where the internal DNS is, we're only using it for internal names on our network. The main reason to move it off that box would be to eliminate the external load from our router, but I'm worried about this: If were to point the old DNS server at 127.0.1, we're guessing that we should set its local DNS cache to "never", and the "never" setting probably means that the cache should never ever expire? That's fine, I'd expect that setting, right? But then what if when we turn off the new DNS box and the old one times out? It caches its records locally for a short time, so it'll look like our users can't go out to those addresses - that might even be the case because of TTL. Should it always cache records for a long time when possible to "be safe"? And even if it didn't cache them locally, would our users be able to view those records on google?

So I guess I'm confused about whether we have to worry about caching, or not, or which way a cache will work in our case. Can someone clear up my confusion If you make your local dns cache expire as soon as a record expires then you don't want it. To expire. When a dns cache is forced to expire (due to expiration of the TTL) all other copies of the record are notified of the new information. Since it is impossible to have the new information available in all locations the dns cache is notified of the new information. The cache needs to be configured with a small time threshold to ensure this does not impact. Your site or business. There is really no need to specify IP addresses for DNS name servers. Any computer capable of accessing the Internet has Internet protocol address information, and can resolve any domain. Hosting server. To avoid overloading those servers with unnecessary requests, we should use IPs in the glue addressing ranges (10.0/8 or 172.16.0/12 etc.) so we can avoid
Requesting names, especially if an external load balancer is involved. DNS servers do a good job keeping record consistency and providing name services without IP addresses.