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how much daily traffic does running your own DNS server generate? (to keep up to date with the domain-IP binding?) I am really interested in trying this...

perennate 8y ago
The DNS requests corresponding to typical HTTP traffic would be negligible compared to that HTTP traffic. DNS servers generally don't generate any traffic except when you perform a query. Should be <512 bytes per request and after a particular domain name is queried it doesn't need to be queried again for some time (depending on TTL).
- DoctorOetker 8y ago
  so its really only somewhat anonymizing if many people use it? is there some kind of distributed DNS table through TOR or something?
oarsinsync 8y ago
If you were to run your own recursive DNS resolver, you'd probably do 3-10x more DNS traffic than you did before, due to the number of requests increasing from 1 to multiple. That said, each DNS request & response is usually under 1KB, so the background traffic doesn't really stop being negligible. Don't run your resolver open to the wider internet, however. Only accept recursive requests from your local network segment, or you'll unwittingly become part of DNS amplification attacks.
- DoctorOetker 8y ago
  oh, I thought a DNS server meant I would be storing my own copy of table of URL's to IP adresses? So the privacy enhancement is tracking by the DNS server? but if my local DNS server forwards these requests, how exactly does it improve my privacy if it does not store a bulk "DNS table" in my amateur speak?
  - antonvs 8y ago
    DNS servers deal with domain names, not URLs. For an HTTPS request, the rest of the URL (path etc.) is only ever sent to the target site, over an encrypted connection. From an information privacy perspective, DNS is a weak link in this mechanism. The reason running your own DNS improves your privacy has to do with how centralized or decentralized your DNS traffic is, and who gets to see it as a result. If you use a DNS controlled by someone else, the DNS operator can see, and therefore (in principle) track, all of the domain name lookups you make that aren't served by your local machine or router's cache. In contrast, if you run your own DNS server that's not just a slave to e.g. an ISP's server, then external domain lookups are made directly against the authoritative DNS servers for the domain you're looking up. There's no longer a single central server, other than your own, that's seeing all your lookups. So if you look up news.ycombinator.com, and the name isn't already in your cache, the request goes direct from your DNS server to an AWS DNS server, because that's who hosts the ycombinator.com DNS. Your non-cached DNS requests are thus spread out across all the DNS servers for all the different domains you're accessing, and the only DNS servers that see your requests are the servers for the domain you're accessing. There are some caveats to this. First, if your ISP is unscrupulous, it can examine your DNS traffic anyway, since most DNS traffic is currently unencrypted (this is changing, but slowly.) To get around that you'd need an encrypted DNS proxy hosted outside your provider's network. Second, large DNS providers like Verisign, GoDaddy, AWS etc. will tend to get a large subset of your requests anyway. However, most of those big companies are publicly focused on information security, and it would be big news if it turned out they were tracking your DNS lookups. Some of them provide audited guarantees that they don't do this.
  - a1369209993 8y ago
    Let's say you look up "porn.example.com" and "dissidents.github.io". . (the ICANN DNS root) sees "io" and "com". com sees "example.com" but not which subdomain or anything to do with io. io sees "github.io" but not which subdomain or anything to do with com. example.com sees "porn.example.com" but doesn't know anything about "dissidents.github.io". github.io sees "dissidents.github.io" but doesn't know anything about "porn.example.com". You leak the same total information, but no single entity has a convenient list of every DNS request you make.

perennate 8y ago

The DNS requests corresponding to typical HTTP traffic would be negligible compared to that HTTP traffic. DNS servers generally don't generate any traffic except when you perform a query. Should be <512 bytes per request and after a particular domain name is queried it doesn't need to be queried again for some time (depending on TTL).

DoctorOetker 8y ago
so its really only somewhat anonymizing if many people use it? is there some kind of distributed DNS table through TOR or something?

oarsinsync 8y ago

If you were to run your own recursive DNS resolver, you'd probably do 3-10x more DNS traffic than you did before, due to the number of requests increasing from 1 to multiple. That said, each DNS request & response is usually under 1KB, so the background traffic doesn't really stop being negligible. Don't run your resolver open to the wider internet, however. Only accept recursive requests from your local network segment, or you'll unwittingly become part of DNS amplification attacks.

DoctorOetker 8y ago
oh, I thought a DNS server meant I would be storing my own copy of table of URL's to IP adresses? So the privacy enhancement is tracking by the DNS server? but if my local DNS server forwards these requests, how exactly does it improve my privacy if it does not store a bulk "DNS table" in my amateur speak?
- antonvs 8y ago
  DNS servers deal with domain names, not URLs. For an HTTPS request, the rest of the URL (path etc.) is only ever sent to the target site, over an encrypted connection. From an information privacy perspective, DNS is a weak link in this mechanism. The reason running your own DNS improves your privacy has to do with how centralized or decentralized your DNS traffic is, and who gets to see it as a result. If you use a DNS controlled by someone else, the DNS operator can see, and therefore (in principle) track, all of the domain name lookups you make that aren't served by your local machine or router's cache. In contrast, if you run your own DNS server that's not just a slave to e.g. an ISP's server, then external domain lookups are made directly against the authoritative DNS servers for the domain you're looking up. There's no longer a single central server, other than your own, that's seeing all your lookups. So if you look up news.ycombinator.com, and the name isn't already in your cache, the request goes direct from your DNS server to an AWS DNS server, because that's who hosts the ycombinator.com DNS. Your non-cached DNS requests are thus spread out across all the DNS servers for all the different domains you're accessing, and the only DNS servers that see your requests are the servers for the domain you're accessing. There are some caveats to this. First, if your ISP is unscrupulous, it can examine your DNS traffic anyway, since most DNS traffic is currently unencrypted (this is changing, but slowly.) To get around that you'd need an encrypted DNS proxy hosted outside your provider's network. Second, large DNS providers like Verisign, GoDaddy, AWS etc. will tend to get a large subset of your requests anyway. However, most of those big companies are publicly focused on information security, and it would be big news if it turned out they were tracking your DNS lookups. Some of them provide audited guarantees that they don't do this.
- a1369209993 8y ago
  Let's say you look up "porn.example.com" and "dissidents.github.io". . (the ICANN DNS root) sees "io" and "com". com sees "example.com" but not which subdomain or anything to do with io. io sees "github.io" but not which subdomain or anything to do with com. example.com sees "porn.example.com" but doesn't know anything about "dissidents.github.io". github.io sees "dissidents.github.io" but doesn't know anything about "porn.example.com". You leak the same total information, but no single entity has a convenient list of every DNS request you make.