DNS Server Security setting

alice

Delphi Developer

DNS Server Security setting

2003-11-07 08:37:31 AM
delphi278
Hi,
I have a public dns server to host my public domain names. Which ports I
should open to outside world in my firewall?
Thanks a lot!
Alice

Remy Lebeau (TeamB)

Delphi Developer

2003-11-07 08:51:53 AM

Re:DNS Server Security setting

"alice" <XXXX@XXXXX.COM>writes

Quote

I have a public dns server to host my public domain names.
Which ports I should open to outside world in my firewall?
The DNS system runs on port 53.

Gambit

Mervin Pearce [SACS]

Delphi Developer

2003-11-07 10:36:52 PM

Re:DNS Server Security setting

TCP and UDP
TCP for Zone transfer and UDP for DNS Query
"Remy Lebeau (TeamB)" <XXXX@XXXXX.COM>writes

Quote

"alice" <XXXX@XXXXX.COM>writes
news:3faae99b$XXXX@XXXXX.COM...

>I have a public dns server to host my public domain names.
>Which ports I should open to outside world in my firewall?

The DNS system runs on port 53.

Gambit

Simon Devlin

Delphi Developer

2003-11-10 02:14:18 AM

Re:DNS Server Security setting

DNS resolution queries are handled over udp port 53. TCP port 53 is used
for zone transfers, BUT, you should restrict zone transfers to only people
who you trust (such as your upstream ISP).
hth
"alice" <XXXX@XXXXX.COM>writes

Quote

Hi,

I have a public dns server to host my public domain names. Which ports I
should open to outside world in my firewall?

Thanks a lot!

Alice