Re: Multiple DNS
Le 19 févr. 06 à 08:46, Robert Slade a écrit : Hi, I am looking for some advice. I have a network which is based on a number of servers running FreeBsd 6.0 serving Win XP work stations. (yes I know but..) The network is large enough to use DHCP and DNS for the internal network, I have setup a DHCP server with a Dynamic DNS (Bind 9) on one of the servers. That server is handling the LDAP side of the domain. Is your DNS server busy resolving internal requests or external ones ? Mostly external from what I can ascertain, it looks like the mail server (Qmail) doing lookups. There appears to be a fair bit of DNS Traffic which leads to a secondary DNS being required to take some of the load as DNS lookup are slow. The question I have is should I just setup a cashing DNS on another server using the primary as a forwarder or even several servers eg the mail server and the secondary LDAP server, or should I setup a proper secondary DNS using my ISP as a forwarder with dynamic updates from the primary. You should not forward anything to your ISP. This is probably the main reason for your DNS beeing slow. You should make shure you have well defined your network in your conf (so that you don't resolve queries for outside users...)- I would not advise you to forward any queries to your ISP as this will disable the capacity for your own server to build It's own resolver database and forward all the queries to the ISP (resulting in slow answers)! I've now taken out the forwarders. Normaly you should configure the master and the slave to be authoritative for your internal domains. And configure the master and the slave to resolve ALL the Internet domains for your internal network and none for outside domains. That is how I have setup the master, it only answer's queries from the internal network. DNS is very tightly related to network... And we don't have any clue for the topology of your Net. SHORT ANSWER : DON'T FORWARD -- BUILD YOUR OWN DATABASE!! Sorry if this is a bit vague, but I have no experience in this area. Rob Thanks for the info, it has helped me. I had misunderstood the forwarders bit. Many thanks Rob ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: Multiple DNS
DNS lookups aren't being slow because you need a secondary DNS server. Something else in your network or in your configuration is wrong. We serve DNS for thousands of customers off of a pair of systems that are basically equivalent to pentium pro 200's with 128MB of ram. Keep in mind most Windows systems will not switch over to the secondary DNS server defined in their configuration unless traffic to the primary is kicked back with an icmp message host unreachable, or some such. Ted -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Robert Slade Sent: Saturday, February 18, 2006 11:46 PM To: freebsd-questions@freebsd.org Subject: Multiple DNS Hi, I am looking for some advice. I have a network which is based on a number of servers running FreeBsd 6.0 serving Win XP work stations. (yes I know but..) The network is large enough to use DHCP and DNS for the internal network, I have setup a DHCP server with a Dynamic DNS (Bind 9) on one of the servers. That server is handling the LDAP side of the domain. There appears to be a fair bit of DNS Traffic which leads to a secondary DNS being required to take some of the load as DNS lookup are slow. The question I have is should I just setup a cashing DNS on another server using the primary as a forwarder or even several servers eg the mail server and the secondary LDAP server, or should I setup a proper secondary DNS using my ISP as a forwarder with dynamic updates from the primary. Sorry if this is a bit vague, but I have no experience in this area. Rob ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.12/265 - Release Date: 2/20/2006 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Multiple DNS
Le 19 févr. 06 à 08:46, Robert Slade a écrit : Hi, I am looking for some advice. I have a network which is based on a number of servers running FreeBsd 6.0 serving Win XP work stations. (yes I know but..) The network is large enough to use DHCP and DNS for the internal network, I have setup a DHCP server with a Dynamic DNS (Bind 9) on one of the servers. That server is handling the LDAP side of the domain. Is your DNS server busy resolving internal requests or external ones ? There appears to be a fair bit of DNS Traffic which leads to a secondary DNS being required to take some of the load as DNS lookup are slow. The question I have is should I just setup a cashing DNS on another server using the primary as a forwarder or even several servers eg the mail server and the secondary LDAP server, or should I setup a proper secondary DNS using my ISP as a forwarder with dynamic updates from the primary. You should not forward anything to your ISP. This is probably the main reason for your DNS beeing slow. You should make shure you have well defined your network in your conf (so that you don't resolve queries for outside users...)- I would not advise you to forward any queries to your ISP as this will disable the capacity for your own server to build It's own resolver database and forward all the queries to the ISP (resulting in slow answers)! Normaly you should configure the master and the slave to be authoritative for your internal domains. And configure the master and the slave to resolve ALL the Internet domains for your internal network and none for outside domains. DNS is very tightly related to network... And we don't have any clue for the topology of your Net. SHORT ANSWER : DON'T FORWARD -- BUILD YOUR OWN DATABASE!! Sorry if this is a bit vague, but I have no experience in this area. Rob ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions- [EMAIL PROTECTED] «?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§ Gregober --- PGP ID -- 0x1BA3C2FD bsd @at@ todoo.biz «?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§«?»¥«?»§ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Multiple DNS
On 2/19/06, Robert Slade [EMAIL PROTECTED] wrote: Hi, I am looking for some advice. I have a network which is based on a number of servers running FreeBsd 6.0 serving Win XP work stations. (yes I know but..) The network is large enough to use DHCP and DNS for the internal network, I have setup a DHCP server with a Dynamic DNS (Bind 9) on one of the servers. That server is handling the LDAP side of the domain. There appears to be a fair bit of DNS Traffic which leads to a secondary DNS being required to take some of the load as DNS lookup are slow. The question I have is should I just setup a cashing DNS on another server using the primary as a forwarder or even several servers eg the mail server and the secondary LDAP server, or should I setup a proper secondary DNS using my ISP as a forwarder with dynamic updates from the primary. Sorry if this is a bit vague, but I have no experience in this area. Rob ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] A secondary server using the primary as a forwarder is generally a better idea if the primary is stable enough. The secondary will share some load without taking up extra bandwidth. In case the primary is not stable enough, or if you really need to scale by 2 (i.e. share the load evenly between the servers), you'll have to use the ISP's dns servers as forwarders instead. This will cut the efficiency of your DNS cache by two. At our place (3000+ hosts) we have our primary on a rock-solid box and secondaries using it as forwarder. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Multiple DNS
Hi, I am looking for some advice. I have a network which is based on a number of servers running FreeBsd 6.0 serving Win XP work stations. (yes I know but..) The network is large enough to use DHCP and DNS for the internal network, I have setup a DHCP server with a Dynamic DNS (Bind 9) on one of the servers. That server is handling the LDAP side of the domain. There appears to be a fair bit of DNS Traffic which leads to a secondary DNS being required to take some of the load as DNS lookup are slow. The question I have is should I just setup a cashing DNS on another server using the primary as a forwarder or even several servers eg the mail server and the secondary LDAP server, or should I setup a proper secondary DNS using my ISP as a forwarder with dynamic updates from the primary. Sorry if this is a bit vague, but I have no experience in this area. Rob ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
