Reverse DNS lookup is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet.

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Spam issue - outgoing mail server

Our previous developer wrote a basic aspx contact form for one of our hotel clients before leaving, all has been fine with it so far but when testing this week I noticed that although the email sent ...
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Mailserver DNS and rDNS setting

Let me start with the fact that things are quite weird in our organization. Now, we have to place a mailserver for a DNS zone that is under our control, for example xxx.yyy.zzz. However, we can't ...
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IPv6 reverse not resolving for Linux shell “last” and “who”

IPv6 is properly resolving in DNS: > host 2607:fa18:0:2::17 7.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.0.0.0.0.0.8.1.a.f.7.0.6.2.ip6.arpa \ domain name pointer sine.xmission.com. However, the ...
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1answer
115 views

Set up Reverse Delegation for Documentation Address in RFC 5737?

I am using CORE to develop some network emulations to teach some network concepts. One of those concepts is the correct setup of a recursive DNS server for local clients; an authoritative DNS server ...
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164 views

Why does NFS to need a restart to correctly use MDNS to reverse lookup?

I have a problem with NFS denying access to a mount based on a failure to do a reverse lookup. The interesting thing is that the ip addresses are resolvable via getent hosts 169.254.5.xx while NFS ...
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2answers
1k views

Disable reverse lookup in rsync daemon

I'm having an issue with some rsync modules being served through rsync --daemon This lines are from my /var/log/rsyncd.log file : 2013/02/08 12:15:28 [13174] name lookup failed for XXX.XXX.XXX.XXX: ...
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1answer
127 views

Cant see DNS zone Security properties or edit/ADD anything being a domain admin

We have a single domain in multiple forest environment. I tried to add a record to one of the reverse lookup zones of the domains which is a single domain in the single forest , i didnt have the ...
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155 views

Have issues in reverse lookup

I need assistance in a reverse lookup issue. I have a server say XYZ.ABC.COM having an IP 10.20.30.40. If I ping the server, it is resolving to the correct IP. On reverse ping (i.e ping -a ...
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82 views

Given a public IP is there a way to find if the subdomain matches the domain that “owns” it?

Need to find with a reverse DNS lookup if the subdomain matches the domain that owns it. I have a script that gets me the reverse DNS lookup for the IP but not quite sure how to check if the ...
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1answer
53 views

Postfix sending emails via multiple broadband lines

I have a site that send out emails from a postfix server. They have multiple broadband lines for load balancing and failover. I want them to be able to send out emails though both lines without the ...
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1answer
84 views

Reverse DNS lookup doesn't match hostname

There's a service on our local intranet that depends on the hostname mapping to the ip address, it is failing for a centos host inside of a virtual machine. I have set the virtual network adapter as ...
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Ping hostname returns another hostname in output : what does it mean?

When I ping the server sip3.voip-centrex.net, I get this output: PING sip3.voip-centrex.net (194.98.81.144) 56(84) bytes of data. 64 bytes from mpfrrelay.michaelpage.fr (194.98.81.144): icmp_req=1 ...
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77 views

The email sent from my server are marked as spam

I have a dedicated server at OVH. For several days I've noticed I'm in a spam list (spamcannibal). The reason I said was for generic PTR. I've changed and I have commanded to remove from the list. ...
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2answers
2k views

How do I set up a reverse zone file?

I have this zone file in bind: $TTL 86400 mysite.net. IN SOA ns1.mysite.net. admin.mysite.net. ( 2006012008 86400 3600 604800 86400 ) ...
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2answers
324 views

Reverse DNS / PTR with Fasthosts shared hosting enviroment

I'm not that clued up on all aspects of DNS so apologies if this is a stupid question of sorts. Basically I have a VPS with one provider(Xeneurope) and the domain names with another(Fasthosts). Not ...
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1answer
772 views

Having trouble interpreting mail log DNS errors

I have a postfix mail server on Debian. A client of mine just informed me that they were unable to send an email to me and it appears that there is a problem with their mail server. I would like to ...
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1answer
57 views

Providing reverse records for records that map to ISP IP

I have been instructed to use my ISP ip (as a temporary fix for mapping my name server and domain records as my router dishes out rfc 1918 adresses to devices in my network where I am running an ...
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1answer
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domain/IN: has no NS records

I have set up a home web server using Ubuntu 12.10 and I can safely say that it works with regards to router forwarding and ports being found. I know this, because switched my hosting provider's VPS ...
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95 views

Will PTR records for IP's that relay mail?

I am having some spam issues with my mail server. I have multiple servers that are relaying mail through my mail server. I am wanting to know if PTR records for these servers will have any effect ...
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2answers
147 views

How Reverse DNS does what it does

Hopefully this is not a stupid question, but I cannot find a clear cut answer. Can someone please inform me exactly what 'source address' is used in Reverse DNS? Does rDNS pull the IP address from ...
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152 views

how does domaintools.com perform it's reverse ip lookup?

I'm attempting to improve my understanding of the DNS system and am confused as to how domaintools.com manages to resolve all DNs associate with an IP addr. After playing around with dig, i'm stuck. ...
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2answers
619 views

What is the correct mail set up for multiple domains on one server?

I have a machine (centos 5) with one external ip address. On that machine I have many virtual hosts with a few different top level domain names and sub-domains under those eg. sub1.domain1.com ...
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81 views

Reverse DNS is finding someone else's domain

When I do a reverse DNS of my IP address I'm finding a different server name? This isn't my domain name. I was testing my mail server and it gave that warning. How do I fix it? $ nslookup Default ...
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2answers
1k views

How do I update my servers' domain name for Reverse DNS?

I'm updating my mail servers' rDNS and I think I have it all figured out except for one thing. When I installed my OS (Debian Etch), the installer asked me to enter the "domain name". Is the ...
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112 views

Reverse DNS Resolve for MX record

I've two servers running, one is a webserver and it's A record on my (external) DNS provider is in the form of: example.com in A XXX.XX.XXX.171 The other is a mailserver and it's A record is in the ...
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2k views

sshd warning, “POSSIBLE BREAK-IN ATTEMPT!” for failed reverse DNS

Whenever I SSH somewhere I get something like this in the logs: sshd[16734]: reverse mapping checking getaddrinfo for 1.2.3.4.crummyisp.net [1.2.3.4] failed - POSSIBLE BREAK-IN ATTEMPT! And it ...
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416 views

Creating reverse DNS entries which resolve [duplicate]

Possible Duplicate: Reverse DNS - how to correctly configure for SMTP delivery I ran a DNS check and ended up with the following error: FAIL: Found reverse DNS entries which don't resolves ...
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102 views

DNS setup: server1-> CNAME to server2 -> IP address without website being visible on server2

I've been trying to figure this out for a while. I've been googling but I couldn't really figure it out. I have bunch of VPS's for my clients. Each has its own IP address, with a single website on ...
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2answers
555 views

Reverse DNS for two ADs in the same subnet

I currently have two separate AD forests that exist within the same subnet. The two forests have independent copies of the reverse lookup zone for that subnet. Example: Domain A DC1: 10.1.1.1/24 ...
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2k views

what's wrong with my Ubuntu 11.10 bind9 configuration?

I've followed several tutorials on installing your own nameservers and I'm pretty much at my wit's end, because I cannot get them to resolve. Note, the actual domain and ip address has been changed ...
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389 views

PTR and A record must match?

RFC 1912 Section 2.1 states the following: Make sure your PTR and A records match. For every IP address, there should be a matching PTR record in the in-addr.arpa domain. If a host is ...
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Global Reverse DNS look-ups not working

I am moving from an old server to a new one and everything went well until I got to the DNS server. I cannot get the reverse look-up to work. I cannot find any misconfiguration but I'm not an expert. ...
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2answers
217 views

Assigning multiple IPv6 addresses on a Server

Let me uncover my intent. My host provides hundreds of IPV6 addresses free, but charge for an IPV4 address. I have several sites under one server and I was wondering if I can give each site/domain ...
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106 views

How to breakout Reverse DNS Zones

I've inherited a Windows network with Windows server based DNS and there are issues, such as not being able to update PTR records, etc. So, I am at a branch office with our own AD domain and DNS on ...
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3answers
356 views

With regard to anti-spam practices, what exactly does a typical reverse DNS check look for?

My understanding is that a typical reverse DNS lookup will compare the SMTP hostname (provided in the EHLO/HELO command) of an incoming connection and verify that it matches the PTR record for the ...
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1answer
147 views

“Reverse lookup” in DNS zone text file [closed]

Is there an existing tool or a cool or interesting way to find all items in DNS zone file, which are "resolving" to given IP? (not using any DNS server at all) For instance, we might have following ...
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35 views

rDNS records changed to point to .tk domains. why? [duplicate]

Possible Duplicate: My server's been hacked EMERGENCY I was having trouble reaching our plesk control panel on our mediatemple dv. In the process of trying to figure out why I saw that ...
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1answer
665 views

PTR records not been created and/or updated

Windows domain, domain and forest functional levels at Windows Server 2003. Windows 2003 and 2008R2 domain controllers. Same for DNS (AD integrated). Dynamic updates on DNS zones are set to "Secure ...
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1k views

How to prevent DNS lookups when service already disabled DNS lookups?

My enterprise recently deployed a DNS capability to all systems within the enterprise. Due to a fluke asynchronous routing error for some of our servers, we have discovered that even when a service ...
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74 views

Sub-delegate Reverse DNS Performance?

I am currently working on a network with multiple subnets. So far I have implemented one reverse DNS entry that is a monolithic 10.* record covering everything. Is there any benefit or performance ...
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228 views

RNDC: Connection Refused

Just got myself a new VPS, not the first I can assure you. Upon adding any DNS entry, I am prompted with this: WARNING: key file (/etc/rndc.key) exists, but using default configuration file ...
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336 views

Emails sent from our mail server are being detected as Junk/Unsafe [duplicate]

Possible Duplicate: How to send emails and avoid them being classified as spam Email postfix marked as spam by google I'm having a few issues sending email from our mail server. Most seem ...
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3answers
427 views

Sending an Email from 2 Mail Servers

We are currently attempting to move away from using a "local" mail(exchange) server to an cloud based offering for all our automated emails. The problem is that we send and receive thousands for ...
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2answers
6k views

Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server ...
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1answer
1k views

named-checkzone reports 'ns.example.com.ns' has no address records (A or AAAA)

The first thing I see wrong is that its a recursion problem. But I'm not sure where the problems lie in my reverse lookup file. ns should report back as ns.example.com but instead getting ...
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How do I delegate reverse IP to my name server? Who do I contact?

Who do I contact, and how do I figure out who has my reverse IP namespace? I need to update the reverse lookup record, and potentially have it hosted on my own DNS server. For what it's worth, we ...
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1answer
559 views

how do I debug my name server setup on hosted server?

bind9 is running with no reported errors but after 24 hours I am failing to see the domain name propagated. There is one error in the syslog'd start of bind9; would this be enough to prevent ...
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91 views

broadcast.addr. in rDNS?

Our in-addr.arpa zones contain entries like the following. 0.2.0.192.in-addr.arpa. 120 IN PTR broadcast.old. 255.2.0.192.in-addr.arpa. 120 IN PTR broadcast.addr. We don't (nor do any of our ...
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My ISP set up a PTR record for my mail server, but some places aren't seeing it

I have a VPS running Windows 2008 server with plesk 9, which I am using for email. I asked to my ISP to add a PTR record, which they did but my mails still droping into spam box. I have checked ...
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3answers
381 views

DNS naming convention for multi-homed devices

Is it bad practice to have multiple IPs resolve via reverse DNS to the same hostname? Consider a router with multiple interfaces: 1 WAN and 3 separate LANs. Is it appropriate for all four IPs resolve ...