0
votes
1answer
35 views

Reverse DNS zones, are they gluable?

Our DNS infrastructure is a bit fractured. We have multiple separate DNS servers for different parts of the company. However, we do still have some interchange issues. Right now a server from ...
2
votes
3answers
128 views

Get IP network range after reverse DNS?

For analytics purposes, I'm looking at large sets of IP addresses in server log files. I'm trying to perform reverse-DNS lookups to understand where traffic is coming from - e.g. what percentage of ...
0
votes
0answers
19 views

Cisco DNS Inspection disallows Reverse Lookup

I'm trying to use DNS Doctoring on my ASA 5505, but apparenly DNS Doctoring required DNS Inspection, and DNS Inspection forbids reverse lookup requests?! How do work around this? I did find this: ...
0
votes
1answer
109 views

Reverse lookup SERVFAIL

I just set up a DNS server and a web server using Virtualbox. The IP address of the DNS server is 192.168.56.101 and the web server 192.168.56.102. Here are my configuration files for the DNS server: ...
0
votes
1answer
50 views

Dns filezone setup with mx and spf

I am trying to create a mail server. I bought the domain mastermails.info on godaddy.com. I am struggling with the setup of DNS. Whenever I change something in the MX record to make my server ...
1
vote
1answer
38 views

Is there a way to use Bind9 $GENERATE directive for rDNS of ranges bigger than /24?

The $GENERATE directive of bind9 makes it possible to autogenerate the reverse mapping for a range of IPs what is really helpfull for reverse dns of a dhcp range. But it seems that the $GENERATE ...
4
votes
2answers
1k views

Are PTR records added only by the ISPs that provide and manage the IPs?

I checked out with my DNS provider to change the PTR records: Dear Sir, We can not modify the PTR records of the IP addresses that you provided, because these IP addresses are not managed ...
0
votes
1answer
37 views

What domain to set in rDNS

I have a few different domains on a shared IP address. One of them is having trouble sending email, as certain mail servers reject the email for not having rDNS set up properly. The thing is there ...
2
votes
0answers
2k views

server can't find XXX.in-addr.arpa: NXDOMAIN

I am facing problem while configuring BIND DNS sowing server can't find XXX.in-addr.arpa: NXDOMAIN while reverse dns check! everything works on forward DNS lookup but reverse DNS lookup fails. Here ...
0
votes
1answer
79 views

Do reverse entries for name-server, need to match the mailserver name?

I need to setup PTR for a domain and lets say my domain is domain.com and I have my email addresses like email.address@domain.com. I came over this mailing-list article that says: The reverse ...
1
vote
1answer
93 views

Forwarder dns not resolving reverse lookups

I have created one new dns server in lab and its working properly. Earlier we were using another dns server for lab pc's as 10.20.30.xx. which is outside the lab premises. now issue with newly created ...
0
votes
1answer
37 views

Delegate NS resource record of IPv4 subnet

Is it possible for a reverse zone to name another DNS server in the NS record? I want to delegate DNS for all addresses within a subnet to a site using that subnet. Our office leases a subnet which is ...
-1
votes
1answer
44 views

Way to find all domains that have a CNAME to my domain? [closed]

I have a web service that allows users to white-label our software by using their own domain over ours. This is done by the user adding a CNAME record from their domain to our domain. Is there a way ...
0
votes
1answer
75 views

Azure public/private dns resolution

Does anybody know if Azure has the same capability as AWS to resolve an external DNS hostname to the public IP address of the instance outside the network of the instance, and to the private IP ...
1
vote
0answers
45 views

How to DNSSEC Sign Bind9 Reverse Zone

I'm using bind9 and dnssec-keygen/dnssec-signzone. I've had no problem signing my forward zones however I cannot seem to find any documentation on signing reverse zones. What is the process for this?
2
votes
1answer
55 views

Bind9 reverse DNS configuration not working.

I am trying to set up a custom virtual DNS server in Ubuntu. When I try to nslookup with a windows 7 pc within the same virtual environment the reverse DNS seems te fail. My named.conf.local file: ...
0
votes
1answer
95 views

Bind9 on Debian : nslookup point on localhost not my ip server

i have just install bind9 on Debian. I think i haven't configured not everything because i still have a problem with the DNS and the propagation. I think the problem is say by nslookup : Server: ...
0
votes
2answers
40 views

Confusion about rDNS

I am slightly confused as to what has to go in the rDNS settings of my IP. Consider the following scenario: IP: 1.2.3.4 Domain 1: foo1.bar @ A 1.2.3.4 @ MX mail.foo1.bar www CNAME ...
1
vote
2answers
100 views

unable to resolve IP in reverse DNS

This question itself has been asked before several times, but none of the answers given there has worked for me so far. So probably I'm doing something wrong, and I can't figure out what. I'm running ...
0
votes
1answer
213 views

PTR records with Windows DNS Server not working

I am trying to create a PTR record on my domain (kentrosecafe.com.au) so that I can get reverse DNS lookups working. The DNS Server I am using is the Windows DNS server which is on a Wiindows 2012 ...
-5
votes
1answer
36 views

Why we have always two ips as DNS Entry [closed]

Why we have two IPs for dns entry like in Google DNS - 8.8.8.8 8.8.4.4 Or as in OpenDNS - 208.67.222.222 208.67.220.220 Also in router settings, it shows always 2 ips for DNS. Any specific ...
0
votes
1answer
144 views

Reverse DNS to match Sophos name, or mail server name

I think this is a simple question with a simple answer. Our domain, cory.co.uk, reports a DNS mismatch when you do and SMTP test on mxtoolbox.com. I think this is causing issues sending to some ...
1
vote
1answer
135 views

ping -a sometimes returns host name and sometimes returns FQDN. Why? Does this mean DNS is corrupt somehow?

I have a Windows machine called abcd for example and it uses DHCP to receive an IP address (172.28.45.5 for example) When I perform ping -a 172.28.45.5 sometimes I receive abcd as the hostname. ...
2
votes
2answers
350 views

How can nslookup on an IP address return NXDOMAIN but I can still ping it?

I was trying to do some reverse DNS lookups on some IP addresses I see in my traceroute (ultimately to figure out roughly geographically where my path is going through), but I often get results that ...
0
votes
0answers
115 views

BIND9 / DNS Zone / Dedicated Server / Unique Reverse DNS

I locate a dedicated server in a datacenter with no DNS Zone setup. Datacenter panel have 1 textfield only you can fill one Reverse DNS only. According with datacenter instructions here... ...
2
votes
1answer
73 views

Wildcard DNS like “*-test.example.com”

Is it possible to set up a wildcard domain like "*-test.example.com"? The main reason I'm asking is because I'm in the process of setting up Continuous Integration with Jenkins, and we'd like to ...
5
votes
2answers
127 views

How to determine which DNS server has the authority to set rDNS (PTR records)?

or to re-phrase... How to determine to whom authority has been delegated to set rDNS? Background In a multi-tier environment, where a block of IP's is assigned, then further split and assigned ...
0
votes
1answer
146 views

Some E-mails are being rejected, do I need a DNS record for my default gateway?

I have been seeing more of these types of bounceback messages (IP address changed for example): mail.test.com #550-Your message was rejected by this user and was not delivered. 550-Reason: Your ...
0
votes
1answer
76 views

Reverse dns and SaaS Spam Filters

We have an exchange server in the office that for a year or so has just used the built-in spam filters - we have added the SpamHaus IP addresses so that some basic spam filtering is done. However, ...
0
votes
0answers
83 views

Disable glusterFS reverse lookup for hosts

I have set up a distributed GlusterFS volume on 3 bricks. However, since a network issue site-wide, one of the servers is unable to start glusterd. The reason is because the reverse DNS lookup gives ...
1
vote
3answers
199 views

Are generic reverse DNS entries acceptable for an outgoing SMTP server?

Our PTR records are managed by our ISP, as our ranges are too small for them to consider delegating to us. So, every time I want to update an entry, I have to email their support team. In an effort ...
0
votes
1answer
104 views

rDNS setup to prevent emails appearing as spam / phishing messages

We are trying to send email without the email appearing in the spam folder. The emails that we are sending is solicited bulk email. The main problem is that the emails are appearing as phishing ...
-5
votes
1answer
67 views

Domain names have gone down - site still up [closed]

I host a couple of websites on the same Ubuntu server, and as of today both domain names have gone down. PuTTY and FTP still both work so it is obviously a problem with the domain name. I haven't ...
0
votes
3answers
460 views

Does changing the Primary DNS Suffix of a Windows Server 2012 machine require a reboot?

My server has the following IP Addresses: 127.0.0.1 192.168.100.103 208.nnn.nnn.180 199.nnn.nnn.29 It's FQDN is mymachine.example.com. However, calling ...
1
vote
1answer
1k views

Cloudflare, reverse DNS and php mail ending up in spam folder

I've been using Cloudflare to host my DNS, and PHPMailer to send e-mail through ZOHOs SMTP servers with great success, but have found that all my e-mails are hitting Gmail, Zoho and Hotmails spam ...
0
votes
1answer
94 views

What is the structure of zones synthesized by BIND's empty-zones-enable feature?

BIND 9.4.1 implemented automatic empty reverse zones for private address space in order to prevent reverse DNS leakage. This saves an administrator the trouble of having to define these empty zones, ...
0
votes
1answer
132 views

SSH to a server with multiple reverse DNS entries [duplicate]

While SSHing into my server with an RSA key, I get this message: Address 255.100.236.105 1 maps to a1.example.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT! Even ...
3
votes
1answer
72 views

How do providers plan to deal with rDNS for client /64 IPv6 blocks when assigned?

The standard block assigned to a home will be a /64 block to enable autoconfigure. This means the traditional reverse DNS mapping of host-237.miami.ispname.com is not only practical, it's improbable ...
12
votes
1answer
434 views

How to force an ISP to remove false reverse DNS?

There is an IPv4 address (in a /8 managed by ARIN) that I have no control over which reverse resolves to a domain name which I registered. Someone used the IP address to run a scam, and it is ...
0
votes
1answer
111 views

Multi-IP server: how do programs know which IP to use?

I recently tried adding second IP address to our server for various reasons and found that now when I check netstat -anob there are many programs/services listening and establishing connections to ...
0
votes
1answer
92 views

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 ...
0
votes
1answer
47 views

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 ...
0
votes
2answers
97 views

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 ...
-1
votes
2answers
181 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 ...
1
vote
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 ...
3
votes
3answers
311 views

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 ...
0
votes
0answers
80 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. ...
-1
votes
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 ) ...
0
votes
2answers
403 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 ...
2
votes
1answer
933 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 ...