Setting up reverse DNS
I've run my own DNS for some years under OS X Server, but in the past couple of months have had a real problem with mail from my domain to AOL and other domains bouncing since my reverse DNS was handled by AT&T, which returned one of those "consumer"-type adsl-whatever zone names instead of my zone name, neko.com. AT&T has now delegated reverse zone lookups to my server.
My IP block extends from 71.158.134.193 through 71.158.134.222. Neko.com is 71.158.134.213.
I've used Server Admin to set up the reverse zone file, which it created and named "134.158.71.in-addr.arpa." Reverse lookups, i.e. "dig -x 71.158.134.213" don't work; AT&T insists the reverse zone file should be called "192.134.158.71.in-addr.arpa".
Of course renaming the file doesn't work since that's not the file name in named.conf. But I don't see any way to specify an IP range or net mask in Server Admin; it's as though it can't handle anything less than a full class C domain.
Any hints?
G5 Quad Mac OS X (10.4.7)
The reverse zone file should be called:
/private/var/named/hosts/masters/134.158.71.in-addr.arpa-hosts
and inside that file you should have something like this:
@ 1D IN SOA dns.neko.com. hostmaster.neko.com. 2007071905 8H 2H 1W 2H
@ IN NS dns.neko.com.
@ IN NS ns1.neko.com.
213 IN PTR neko.com.
Explanation: "dns.neko.com" would be your primary dns server.
"ns1.neko.com" would be your secondary dns server.
"hostmaster.neko.com" would be your hostmaster email address ([email protected]).
NOTE: all domains end in period (ie, there is a '.' after every 'com') - that is not a typo!
NOTE: use a period for the 'at' sign in you hostmaster email address - do NOT use @ there - that is also not a typo!
some good resources:
http://www.menandmice.com/knowledgehub/dnsqa/49
http://www.menandmice.com/knowledgehub/dnsqa/56
The AT&T people are confused. You have to cut them some slack though, they're too busy playing with their new iPhones to know what they're talking about.
Similar Messages
-
Set up reverse DNS for virtual mail hosting
I need a bit of server configuation advice.
I have a static IP and two public domains on a Snow Leopard server connected using NAT behind a firewall - with the necessary port forwarding to ensure all works.
1. abc.com is my primary domain on the server - server.abc.com
2. I have xyz.com set up as a virtual domain and also as a virtual mail host
This setup has worked well for a long time but I have found that emails to [email protected] are going missing. If I check my mx records using one of the web based tools it show an error on the reverse dns for server.xyz.com showing a reverse DNS of server.abc.com.
So the question - is it possible to have secondary 'virtual' DNS record on the server so reverse DNS works for the virtual mail host xyz.com? If not how do I handle the reverse DNS problem which i think is causing some external mail server to reject mail due to the inconsistency on the reverse DNS lookup?
Many thanks for any suggestionsSMTP requires a DNS A record.
A DNS A record is also known as a machine record.
A DNS A record inherently means that forward DNS and reverse DNS will match.
The forward translation translates the host name to the IP address.
The reverse translation translates the IP address to host name.
When the full translation produces the same host name, that's an A record.
DNS CNAME records are aliases, and are used for virtual hosts.
CNAME records inherently do not match the reverse DNS translations.
To get your configuration to work, your server must have an A record.
That means forward and reverse DNS will match.
Any of the virtual hosts within your mail server then all use an MX pointing at the A record host.
If you have your DNS hosted somewhere other than your ISP, then you'll need your ISP to set up a DNS PTR.
The DNS PTR is the reverse translation; address to name.
If you have your own DNS services within your network (as would be typical with a privately-addressed NAT'd network), set that up as a virtual host within SMTP.
Here is some related reading on external (public) DNS, as related to SMTP servers and such. -
Warning - Reverse DNS does not match SMTP Banner
I have a installed in exchange server 2013 in the Home network. Everything looks fine. But Reserve DNS was not setup properly. Reverse DNS is not matching with my domain. "Reverse
DNS does not contain the hostname" when I checked in MXToolBox.com
I have configured FQDN on port 25 to mail.xxxxx.com. I don't know what else need to configure as Iam new to exchange.
Can some give me some steps to do this?
ItsMeSri SP 2013 FoundationReverse DNS (aka PTR record) is something set at your ISP level, not on your Exchange server. If you have a static IP from your provider you should be able to contact them (or log into the ISP's portal) to change the reverse DNS. If you have a dynamic IP
(meaning you didn't pay extra for a static) you will be unable to set your reverse DNS.
The implication's of not having a matching reverse DNS is that many email providers will not allow you to send them email (ex. aol.com, hotmail.com). I am actually in the same boat (on a dynamic IP) but I set up my Exchange to send all my email through a
spam filter service. If you send through a reputable spam filter you should have no issues sending to any email providers (even though reverse DNS checks will still fail). -
DNS question and no name available via DNS and no reverse DNS errors
We are running an OS X server, 10.4.11, OD Master. We are getting some error messages, and we have setup DNS to forward requests for example.com. (our website) to our web developer's external web server where our website is being hosted.
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no name available via DNS for 192.168.0.5
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly
Oct 15 10:31:48 [server name omitted] /usr/sbin/PasswordService: incorrect digest response
- and -
Oct 15 09:54:00 [server name omitted] DirectoryService[103]: GSSAPI Error: Miscellaneous failure (Server not found in Kerberos database)
Some Background:
We are running internal DNS services only. We have a domain, example.com. and our OS X Server, server.example.com. We have a website that is being hosted offsite by our web developer. Long ago when they were setting up the SSL certificate for the site, they obtained a certificate for example.com INSTEAD of www.example.com. So, our web developer setup a redirect to redirect web requests to www.example.com to example.com.
Now, this brings us to our OS X server (server.example.com). We are hosting internal DNS with the same domain, example.com. When employees inside our LAN would put in our web address, example.com, or www.example.com, it would take them to our OS X server. As a workaround, in the DNS settings for the zone in server Admin, I set the Server IP address for the zone to "Other" and specified the external address to the server where the site is hosted by our developer then setup an A record for our server. (We cannot forward requests to www.example.com since our web developer automatically redirects these requests to example.com since that is where the SSL certificate and the search engines are linked to).
Well obviously this had serious repercussions for server stability. So, I set the server IP address back to the address of our OS X server itself, 192.168.0.5.
Now, I then went into command line and manually edited the zone files. Here's part of our zone file:
$TTL 3600
example.com. IN SOA server.example.com. sysadmin.example.com. (
2008031015 ; serial
3h ; refresh
1h ; retry
1w ; expiry
1h ) ; minimum
example.com. IN NS server.example.com.
example.com. IN A [external IP address of web server]
server IN A 192.168.0.5
We are getting the following error messages regularly:
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no name available via DNS for 192.168.0.5
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly
Oct 15 10:31:48 [server name omitted] /usr/sbin/PasswordService: incorrect digest response
- and -
Oct 15 09:54:00 [server name omitted] DirectoryService[103]: GSSAPI Error: Miscellaneous failure (Server not found in Kerberos database)
Questions:
Do I need to go back to our zone file and change the A record for example.com. to match our OS X server's address: 192.168.0.5?
Secondly, is there anything I can do in DNS or elsewhere on the server to redirect web requests to example.com to our web developer's offsite server since the developer's server redirects www.example.com to example.com?
Thanks in advance? I am stumped.
Thanks,
TylerProblem was resolved.
All I ended up doing was edition my reverse lookup file, db.192.168.0. It was correct, and I simply re-saved it without making any changes. Strangely enough, that did it. No idea why. Maybe a permissions issue with the file?
I'm still running the server with address record for the domain (example.com.) mapped to our external web server. no problems.
Tyler -
How to disable reverse DNS lookup on SSH login
How do I disable reverse DNS lookup on SSH login in Solaris 9? I'm using the version bundled with Solaris 9.
OpenSSH documentation says that I should set UseDNS to no but the option doesnt work in the bundled version of SSH server.
I do not want to upgrade the bundled version of SSH server. Your help will be greatly appreciated.Ah nevermind. I think it was some command I ran changing english.lproj that did this so i am starting over.
-
Setting up SLS & DNS in particular
I would really appreciate some step-by-step guidance on setting up SLS and DNS in particular. I've read all Apple's documentation and dozens of guides and discussions but remain confused about several points, and my set-up still isn't working correctly.
I have the latest SLS on a Mac Mini, which is behind my Draytek 2820vn router. I have 3 Mac clients (all 10.6.6) and 3 OSX devices. I primarily want to share address books and both share and sync (between devices) iCal. I want to be able to do this from outside my LAN, so need to run Mobile Access.
I have a static IP address from my ISP, to which my sub-domain (e.g. network.mydomain.com) points via DNS with my domain registrar.
I seem to have DNS running ok on the server, at least for my LAN (the -checkhostname and dig commands all return the right results). I can get my clients to log on to the network from within the LAN but not get iCal or the address books playing along.
I have enabled port redirection in my router for:
* iCal Server SSL on 8443
* Address Book Server SSL on 8843
* DNS on 53
* Web service on 80
* HTTPS on 443
I prefer to use SSL for maximum security (though am not sure if I also need to open up the non-SSL ports for these services).
So my questions are:
1. Do I need to redirect any other ports?
2. Do I need a reverse DNS with my ISP (i.e. external to my LAN), for the services I am wanting to run?
3. Do I have to enter the static IP address of the SLS in my router as the primary DNS, with my external DNS as the secondary? (I have done this.)
4. How should I configure the firewall on SLS, given its location behind the Draytek? I want a very secure set-up.
5. Does anyone have any other pointers on getting everything to work with this particular arrangement?
Many thanks for any expert feedback. Please note that I'm pretty Mac-proficient for a amateur, but have never set up a server before, so have a limited grasp of the lingo and things like command line.
Many thanks.* iCal Server SSL on 8443
* Address Book Server SSL on 8843
* DNS on 53
Close that DNS port. You don't want to be fielding in-bound DNS translations.
* Web service on 80
Unless you're planning to serve web sites, close that.
* HTTPS on 443
Ibid.
I prefer to use SSL for maximum security (though am not sure if I also need to open up the non-SSL ports for these services).
[What IP ports need to be opened|http://support.apple.com/kb/ts1629] depends on what services are required, and whether or not you're using a VPN.
1. Do I need to redirect any other ports?
That's one only you can answer, as it is dependent on what you want to do here.
A different question that you want to consider for cases such as this is "how can I close more ports?".
The usual answer is via VPN.
One of many other answers can include a firewall with DMZ capabilities, and a network where you park the server in its own network jail. (A DMZ is a two-firewall firewall box; where you can have an untrusted WAN network, a slightly trusted but still restricted DMZ, and a more trusted internal LAN.)
2. Do I need a reverse DNS with my ISP (i.e. external to my LAN), for the services I am wanting to run?
For secure services, you'll want reverse DNS. That can include ssl services, though (with control over your clients and the boxes that are attempting to connect your LAN) it's not critical.
Reverse DNS is (far) more central to SMTP services, and to ecommerce, and to any cases where you don't control the remote clients, and where the clients are thus dependent on your forward and reverse DNS, and your certificates matching your DNS.
You need LAN-based DNS with Snow Leopard Server, either on the server or with another DNS server on your LAN. [Here is how to set up LAN DNS|http://labs.hoffmanlabs.com/node/1436]
Your ISP will not typically be in a position to provide DNS translations for the private address space. (That's shared and non-routed IP address space, so your ISP would needs to set up DNS for you.)
3. Do I have to enter the static IP address of the SLS in my router as the primary DNS, with my external DNS as the secondary? (I have done this.)
I don't run hosts as gateways. That's more work, and it's less secure.
4. How should I configure the firewall on SLS, given its location behind the Draytek? I want a very secure set-up.
There's no direct answer for that, and there are many different network designs and many different degrees of risk aversion and different degrees of budgets. For some environments, I run locked down. For others, not so much.
5. Does anyone have any other pointers on getting everything to work with this particular arrangement?
[Here is how to set up LAN DNS|http://labs.hoffmanlabs.com/node/1436], and [here is the public-facing DNS set-up|http://labs.hoffmanlabs.com/node/1594] and [here is a quick intro to networking pieces and parts|http://labs.hoffmanlabs.com/node/275]. -
How to setup DNS behind Airport Extreme and ISP that will not reverse DNS
Hi,
I am having issues setting up my Mac Mini with SLS. Right now my server is connected to the internet through my Airport Express. It gets a static address from the router (10.0.1.13). The router also has a static address from my ISP. I own the domain redcedarpoint.com. I have set the A record to point to my static router IP address. I also setup a CNAME for server.redcedarpoint.com to the same address.
During the initial portion of setup SLS sees my ISP's domain versus my own domain and incorrectly fills the local domain name. I manually changed these to redcedarpoint.com and called the server 'server'. This puts server.redcedarpoint.com into all the host names. Everything seems to work, but now all my users get email addresses like [email protected] versus [email protected]. I have manually set mail host name to redcedarpoint.com (although this is wrong I think). It solves the email addressing issue, but now postfix gives me a warning about a duplicate:
+Jan 27 21:20:45 server postfix/postmap[70670]: warning: /var/amavis/local_domains.db: duplicate entry: "redcedarpoint.com"+
My question is: What should I fill in during setup and how should I setup DNS from my hosting service.
By the way, I am also trying to funnel all inbound and outbound email through my premium Google Apps subscription.
Here's also the result of postconf -n
+Last login: Wed Jan 27 21:19:47 on ttys000+
+server:~ ianknight$ postconf -n+
+biff = no+
+command_directory = /usr/sbin+
+config_directory = /etc/postfix+
+content_filter = smtp-amavis:[127.0.0.1]:10024+
+daemon_directory = /usr/libexec/postfix+
+debugpeerlevel = 2+
+enableserveroptions = yes+
+header_checks = pcre:/etc/postfix/customheaderchecks+
+html_directory = /usr/share/doc/postfix/html+
+inet_interfaces = all+
+mail_owner = _postfix+
+mailboxsizelimit = 0+
+mailbox_transport = dovecot+
+mailq_path = /usr/bin/mailq+
+manpage_directory = /usr/share/man+
+mapsrbldomains =+
+messagesizelimit = 10485760+
+mydestination = $myhostname, localhost.$mydomain, localhost, dmcwatering.com, internationalcardio.com+
+mydomain = redcedarpoint.com+
+mydomain_fallback = localhost+
+myhostname = redcedarpoint.com+
+mynetworks = 127.0.0.0/8,216.239.32.0/19,64.233.160.0/19,66.249.80.0/20,72.14.192.0/18,209.8 5.128.0/17,66.102.0.0/20,74.125.0.0/16,64.18.0.0/20,207.126.144.0/20,173.194.0.0 /16+
+newaliases_path = /usr/bin/newaliases+
+queue_directory = /private/var/spool/postfix+
+readme_directory = /usr/share/doc/postfix+
+recipient_delimiter = ++
+relayhost =+
+sample_directory = /usr/share/doc/postfix/examples+
+sendmail_path = /usr/sbin/sendmail+
+setgid_group = _postdrop+
+smtpsasl_authenable = yes+
+smtpsasl_passwordmaps = hash:/etc/postfix/sasl/passwd+
+smtpdclientrestrictions = permit_mynetworks permitsaslauthenticated rejectrblclient zen.spamhaus.org permit+
+smtpdenforcetls = no+
+smtpdhelorequired = yes+
+smtpdhelorestrictions = rejectinvalid_helohostname rejectnon_fqdn_helohostname+
+smtpdpw_server_securityoptions = cram-md5,gssapi,login+
+smtpdrecipientrestrictions = permitsaslauthenticated permit_mynetworks rejectunauthdestination checkpolicyservice unix:private/policy permit+
+smtpdsasl_authenable = yes+
+smtpdtlsCAfile =+
+smtpdtls_certfile =+
+smtpdtls_excludeciphers = SSLv2, aNULL, ADH, eNULL+
+smtpdtls_keyfile =+
+smtpdtlsloglevel = 0+
+smtpduse_pwserver = yes+
+smtpdusetls = no+
+unknownlocal_recipient_rejectcode = 550+
+virtualaliasmaps =+
+server:~ ianknight$+The first one is easy...
Jan 27 21:20:45 server postfix/postmap70670: warning: /var/amavis/local_domains.db: duplicate entry: "redcedarpoint.com"
You have redcedarpoint.com set as both the domain name and the hostname of the server. That is not correct:
mydomain = redcedarpoint.com
myhostname = redcedarpoint.com
In this case, myhostname should be the reverse DNS hostname that the recipient mail server would see on outgoing mail - typically this would be something like 'mail.redcedarpoint.com
You should also fix the mydestination parameter so that it includes your domain name as well:
mydestination = $myhostname, localhost.$mydomain, localhost, dmcwatering.com, internationalcardio.com
mydestination identifies the domains this server accepts mail for. In this setup it will accept mail addressed to @mail.redcedarpoint.com (assuming you fix myhostname, as above), @localhost.redcedarpoint.com, @localhost, @dmcwatering.com and @internationalcardio.com
Nowhere here does @recedarpoint.com appear, so users won't get mail addressed to [email protected]
It's easiest to just add redcedarpoint.com to the list of domains the server handles mail for.
how should I setup DNS from my hosting service
Your subject implies a reverse DNS question, but there's nothing in this post about reverse DNS. Other than that, you should have an MX record for your domain that points to the public IP address of your router. -
Reverse DNS does not match SMTP Banner
Hello,
We have a client with an SLS who is configured to send mail using the ISP as relay. With this situation, the server-side mail rules (vacation notices) are not working.
So, I need to configure the server to use DNS to send mail. The client has one public static IP, in the form of client.static.isp.gr. ISP refuses to change the PTR for a single IP, so when I check the server using mxtoolbox.com, I get +Reverse DNS does not match SMTP Banner+.
In MS Exchange, you can set the "Internet e-mail name" and change the default SMTP banner.
How can I change the SMTP banner in Postfix? (in order to put the ISPs PTR for the static IP).
Regards
KostasKostas B. has been tussling with other issues ("ISP refuses to change the PTR for a single IP") and this is unrelated to the configuration of Mail itself, from what I can tell of it. He's really trying to do something that the ISP involved isn't supporting, and that's more of an administrative or ISP issue and less of a technical issue.
As for your question (and presuming your public-facing DNS forward and reverse translations are correct and your MX record is correct, details which are not yet in evidence), launch Server Admin and set your mail server host name in the mail configuration. Server Admin > select server > Mail > general > fill in your internet-facing host name. This name should matche your public DNS MX record, and your public forward and reverse DNS translations should (also) match.
And as a general rule, please don't thread-jack. That largely serves to confound and confuse the discussions. -
Exchange 2013 Reverse dns setup
I recently migrated from SBS to Standard Windows servers with exchange 2013 and I'm having a heck of a time fighting spam. Mailflow is working fine, and we setup spam fighter exchange module which is catching most of the spam. However, it is missing some
that are spoofing our domain name with addresses that do and don't exist. I've read that the best way to stop this is to setup spf filtering and to do this you should setup reverse dns ptr records so you don't get blacklisted. The directions are rather confusing.
They say to setup a ptr record with your mail server's ip address. Here are my questions...
Do I have to set this up on both my dns and my service providers dns?
I currently have a A record and a ptr record pointing to the internal ip address on my internal dns server with the actual server name, but no records pointing to remote.domain.com.
Do I need to create additional A and PTR records using the External IP and remote.domain.com?
Right now my mx record points to mail.domain.com, but all of our connectors use remote.domain.com. Should the mx be changed to remote.domain.com?
Thanks for any help.I've read that the best way to stop this is to setup spf filtering and to do this you should setup
reverse dns ptr records so you don't get blacklisted
Some antispam products to a reverse lookup on your IP address to make sure it matches the entry in the forward lookup zone. It does this to check that your server
is not spoofing the server name.
This won't necessarily prevent getting blacklisted (especially if you are sending spam), but it is definitely recommended for your mail architecture.
Do I have to set this up on both my dns and my service providers dns?
You will need to set this up on your Service Provider's DNS, as they will
technically own the IP address, and lease it to you.
Best practice is to have reverse lookup zones for your internal subnets in your internal DNS as well.
But this is not so much a spam related thing, as just a good idea.
Right now my mx record points to mail.domain.com, but all of our connectors use remote.domain.com.
Should the mx be changed to remote.domain.com?
This depends what these are used for. As you have come from an SBS environment, I'm guessing that both
of these names resolve to the same public IP address. If this is the case, you can leave the MX records as they are. If this is not the case, let me know and we'll discuss it later.
Let's say that you have a server called
mbx.contoso.com internally with an IP of
192.168.0.1. Externally, this server is known as mail.contoso.com
and has an IP address of 123.123.123.123.
In this case, you would do two things:
On your internal DNS server(s), create a reverse lookup zone for
192.168.0.0 and create a PTR record for
mbx.contoso.com with the IP of 192.168.0.1. This may already be done from when you set up Active Directory initially
Contact your ISP, and ask them to setup a
PTR record for mail.contoso.com for the IP
123.123.123.123 -
Still cannot resolve "gethostbyaddr() and reverse DNS name" warnings.
"Mar 15 11:02:48 xs1 servermgrd: servermgr_dns: gethostbyaddr() and reverse DNS name do not match (xs1.dept.school.edu != xs1.dept.School.EDU), various services may not function properly - use changeip to repair and/or correct DNS"
I have two xserves, both of which keep generating the same warnings, ad nauseam, in /var/log/system.log and having followed all suggestions and instructions in discussions, technical notes, afp548.com, and from other sysadmin's I still cannot stop them. There do not seem to be any services affected, or at least not in an overt manner.
Both xserves run slightly different services: (xs1) AFP, Firewall, NetBoot, NFS, Open Directory (slave), Print and Web; and (xs2) AFP, Firewall, Open Directory (master) and Software Update.
On both xserves I have run the following commands/tests with correct results, yet still I get the warnings in system.log: "changeip -checkhostname" is correct, and "scutil --get HostName" is correct. The /etc/hostconfig file is correct with "HOSTNAME=-AUTOMATIC-".
The only thing I can consider is that when setting them up, I had entered the FQDN in all lower-case, but the reverse dns is not, our domain is capitalized, and the tld is in all caps on the DNS servers. I had ages ago issued the "changeip" command as recommended in the warning, to no effect, even though "changeip -checkhostname" says it's correct.
Where the heck to I look now? This is driving me nuts!
RackMac1,1 & RackMac3,1 Mac OS X (10.4.8)>As of 10.4.6, Apple states to never change /etc/hostconfig's HOSTNAME entry.
Inside the little black box that Apple runs Mac OS X Server this might be good advice. However, in the real world, real servers are often outside of Apple's box (sometimes far outside) and you have to do certain things that Apple don't advise or 'support'.
I can't tell you how many things I run on my servers that are outside the box and judging by other posts on these boards I'm not the only one. You only have to look at DNS, web and mail for starters to see that Apple's model doesn't cover everyone's needs. -
Reverse DNS not function properly
Please tell me how to do a Reverse DNs in java
e.g IP address of a network machine is 192.168.0.30
Then how can i get its name (i.e machine name)?
I know that i mus thave to use a jdk 1.4
Please prvide a full solution.
Thanks.The following code shows how to get the hostname for an IP address:
import java.net.*;
public class TestReverse {
public static void main(String[] args) {
try {
InetAddress local = InetAddress.getByName(args[0]);
System.out.println(local.getHostAddress());
System.out.println(local.getHostName());
System.out.println(local.getCanonicalHostName());
} catch(Exception e) {
e.printStackTrace();
}For example, running java TestReverse 207.46.230.220 produces:
207.46.230.220
www.domestic.microsoft.com
www.domestic.microsoft.comNote that it is possible to resolve names for your local network (at least it is on my Windows machine) when you put names for your IP addresses in the local host file (or of course, when you set up an internal DNS that resolves reverse lookups).
Local network ranges may not be valid on the Internet, they are valid InetAddress'es. -
HELP! Disabling reverse DNS lookups on client
Is there a property that can be set to disable the reverse DNS
lookup for client requests? I read that if reverse lookups are
no working then client requests can take an extra 15-30 seconds.
In our environment reverse lookups are not something we can
count on so we would like to disable them completely. Please let
me know which property can be set it if any to accomplish this.
Regards,
RobertDon't we all ;)
WL 5.1 sp3
Sol 2.6
J2 1.2.1_04
Rich Nill wrote in message <[email protected]>...
Paul,
What version of Weblogic are you running? I want to make sure we don'tsuffer
from the same problem.
Thanks,
Rich
Paul Iter wrote:
Would this patch have any impact on the problem I described in
"performance
degradation PROBLEM"?
Thanks,
Paul
Mark Griffith wrote:
There is another issue here though, when we print out server ID's we
call
java.net.InetAddress.toString() which ends up in a DNS call.
Contact support they have a one-off patch.
cheers
mbg
In article <[email protected]>, [email protected]
says...
Is there a property that can be set to disable the reverse DNS
lookup for client requests? I read that if reverse lookups are
no working then client requests can take an extra 15-30 seconds.
In our environment reverse lookups are not something we can
count on so we would like to disable them completely. Please let
me know which property can be set it if any to accomplish this.
Regards,
Robert
==================================================
NewsGroup Rant
==================================================
Rant 1.
The less info you provide about your problem means
the less we can help you. Try to look at the
problem from an external perspective and provide
all the data necessary to put your problem in
perspective. -
Is it possible to override authorative reverse DNS lookups?
Hello,
I am part of collaborative workgroup which has a group of networked computers that are installed at each others sites. This means that often a server has two names - a "site name", which is the name in DNS, such as BigFoot.yale.edu at X.X.X.5 and a "workgroup name", the name used by the group for distributed processes, such as YaleBigFoot.workgroup.net also at X.X.X.5 in our /etc/hosts file.
We are trying to use globus and GSI authentication in between the servers which requires valid reverse dns lookups, such that a CN=host/ .
On unix'y servers, this requires setting up a rather comples /etc/hosts and editing /etc/nsswitch so that /etc/hosts is used authoritively for all lookups.
I have been trying to replicate this behavior for our Mac users, and I'm running into problems. I have read all the "reverse dns" documentation I can - and it appears that my problem is different.
I have setup a /etc/hosts file and a /etc/lookupd/hosts configuration file and a /etc/named.conf section for workgroup.net and a /var/named/workgroup.net.zone file.
However I still get the following output:
$ host yale-bigfoot.workgroup.net
yale-bigfoot.workgroup.net has address X.X.X.5
$ host X.X.X.5
X.X.X.5.in-addr.arpa domain name pointer workgroup-router-node.net.yale.edu.
Is it possible to override the authorative reverse lookups?
Thank you in advance,
Brendan
PS: names and address are not actual
17' SuperDrive Powerbook G4 Mac OS X (10.4.6)However, you can achieve do something that looks similar to overriding.
class Parent {
Parent(int i, String s) {
// do stuff
class Child extends Parent {
Child(int i, String s) {
super(i, s);
// do Child stuff here
new Parent(1, "abc");
new Child(2, "xyz");Although that's not overriding, it sort of looks similar. Is this what you were talking about? -
Having trouble setting up Open DNS with mac.
When I try to set up Open DNS I get the following error message:
Safari can’t open the page “http://192.168.1.1/Basic.tri” because the server unexpectedly dropped the connection. This sometimes occurs when the server is busy. Wait for a few minutes, and then try again.
I have a Linksys router. I can get the router so save the settings using my Microsoft laptop, but I get an "oops" error message from Open DNS saying I am not set up on their site and just sends me back to step one. Does this sound familiar to anyone?No, you cannot put the router in front of the modem.
You might look for any information your ISP gave you for your modem, such as a user guide. Or use the instructions at OpenDNS for a Motorola router, it should be similar. Remove the router and directly connect just one computer to the modem and try to access the modem's built in utility, as you have with your Linksys router. Motorola's default address appears to be "http://192.168.10.1/", the default username is "admin", and the password "password". If you encounter a question about obtaining the DNS service dynamically, check NO, then handset the OpenDNS servers, save and possibly restart the modem.
If you are successful in configuring the modem, go back to the router and leave the DNS settings blank, as well as on each computer. Then the computers should receive the service dynamically from the modem.
After all that, hopefully the OpenDNS website detects you using their service and allows you to proceed with setting up your account.
Dah•veed -
I am trying to set an open DNS using the MacAir. But when I tried to flush the existing one at utilities/terminal, it will not work. I am using Yosemite. May I know what should be the command line so that I can shift to an open DNS? Thanks
>SystemPreferences>Network>DNS
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