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Apparently you need a Unix system to use dig?  I just tried it at the MS-DOS prompt under Windows XP and it said dig was not recognized as a command.

It's actually that these network tools aren't a part of the Windows distribution. In the FAQ there are external links provided for some on-line tools, other places have software tools that can be installed to run some of these things under Windows (though most do default to using an MS-DOS mode/interface)

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$ dig [at]dns1.name-services.com cesmail.net mx

; <<>> DiG 8.3 <<>> [at]dns1.name-services.com cesmail.net mx

; (1 server found)

;; res options: init recurs defnam dnsrch

;; got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4

;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 5

;; QUERY SECTION:

;;      cesmail.net, type = MX, class = IN

;; ANSWER SECTION:

cesmail.net.            1h1s IN MX      5 mx.cesmail.net.

cesmail.net.            1h1s IN MX      10 mx2.cesmail.net.

OK, that's a valid answer

I wonder why there are no IP addresses being returned for either of the MX values? The IP numbers should be in there...this is part of the problem, I think.

No, actually, there is no requirement for the nameserver to go ahead and provide that IP. Yes, most do. However, it is perfectly legal for them not to. You asked for the MX record and it responded with the MX record. What any nameserver would do then is turn around and ask for the A record for mx.cesmail.net. Now, if the original nameserver had gone ahead and also returned the A record, the resolving nameserver would have used that (probably). However, it isn't required and I'm positive that no nameserver in the world would croak if it didn't get that. In fact, if you look at the other query you posted, the A records are returned in the "Additional" section, not the "Answer" section. Everything in the Additional section is optional.

So, the dig you posted is valid and doesn't show an error. I'd really like to see a dig where the nameserver answers and says the MX or A record doesn't exist.

JT

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I'm striking out all over ... I started with looking up the NS of some of the posters and tried using those to do the nslookup / dig stuff ... SamSpade for Windows and an iBook in use .. those that let me query their stuff brought back an answer. I have yet to come across a failure. Sorry.

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Rather than "dig," I'm more familiar with this kind of lookup on a local host:

$ nslookup -type=mx cesmail.net

Server: ns.oneononeinternet.com

Address: 64.176.60.14

cesmail.net preference = 5, mail exchanger = mx.cesmail.net

cesmail.net preference = 10, mail exchanger = mx2.cesmail.net

cesmail.net nameserver = dns1.name-services.com

cesmail.net nameserver = dns2.name-services.com

cesmail.net nameserver = dns3.name-services.com

cesmail.net nameserver = dns4.name-services.com

cesmail.net nameserver = dns5.name-services.com

dns1.name-services.com internet address = 63.251.163.102

dns2.name-services.com internet address = 216.52.184.230

dns3.name-services.com internet address = 63.251.83.36

dns4.name-services.com internet address = 64.74.96.242

dns5.name-services.com internet address = 212.118.243.118

You'll note that it returns both "mx" and "mx2" but again, the IP addresses aren't showing up. When I run an MX lookup in this fashion on virtually any other host on the 'Net, I get something like this:

$ nslookup -type=mx choralnet.org

Error with history file

Server: ns.oneononeinternet.com

Address: 64.176.60.14

choralnet.org preference = 10, mail exchanger = mail.choralnet.org

choralnet.org nameserver = NS.choralnet.org

choralnet.org nameserver = NS2.choralnet.org

mail.choralnet.org internet address = 64.176.154.200

NS.choralnet.org internet address = 216.147.114.16

NS2.choralnet.org internet address = 216.147.114.17

Here's the lookup for "spamcop.net":

$ nslookup -type=mx spamcop.net

Server: ns.oneononeinternet.com

Address: 64.176.60.14

Non-authoritative answer:

spamcop.net preference = 10, mail exchanger = mx2.spamcop.net

spamcop.net preference = 5, mail exchanger = mx.spamcop.net

Authoritative answers can be found from:

spamcop.net nameserver = asia3.akam.net

spamcop.net nameserver = ns1-109.akam.net

spamcop.net nameserver = ns1-11.akam.net

spamcop.net nameserver = ns1-117.akam.net

spamcop.net nameserver = ns1-73.akam.net

spamcop.net nameserver = ns1-90.akam.net

spamcop.net nameserver = ns1-93.akam.net

spamcop.net nameserver = use1.akam.net

mx2.spamcop.net internet address = 216.154.195.53

mx2.spamcop.net internet address = 216.154.195.36

mx.spamcop.net internet address = 216.154.195.53

mx.spamcop.net internet address = 216.154.195.36

asia3.akam.net internet address = 65.203.234.27

ns1-109.akam.net internet address = 193.108.91.109

ns1-11.akam.net internet address = 193.108.91.11

ns1-117.akam.net internet address = 193.108.91.117

ns1-73.akam.net internet address = 193.108.91.73

ns1-90.akam.net internet address = 193.108.91.90

ns1-93.akam.net internet address = 193.108.91.93

use1.akam.net internet address = 63.209.170.136

In these cases, not only am I supplied tithe the IP of the nameservers, but also the IP of all MX entries. I'm not a DNS expert, but I've run thousands of MX lookup commands like that over the years, and the one for "cesmail.net" is one of the few I've seen that doesn't provide the IP for the MX.

However, more troublesome are the red flags raised at this third-party tool:

http://dnsreport.com/tools/dnsreport.ch?domain=cesmail.net

Specifically:

ERROR: I could not complete a connection to any of your mailservers!

mx.cesmail.net: Could not connect without glue or A record.

mx2.cesmail.net: Could not connect without glue or A record.

That tool seems to think there's no "glue" or A record for the MX values returned for cesmail.net.

DT

Edited by DavidT
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In this case, nslookup is useless. You're not querying the authoritative nameservers, you're querying your own DNS cache. That cache is telling you what it believes, but who's to say whether the cache is right or wrong? We need to catch the authoritative nameservers returning incorrect information if we're going to make progress.

The third-party tool is the same problem. Sure, it says there's a problem. It says there are no A records. When did it query the nameservers? Which nameservers did it query? What exactly were the results of the query? Who knows. You and I know that there's a problem, but if I were running the nameservers and saw that report, it wouldn't be any help at all.

Compare that to the results returned by the squish DNS checker: http://www.squish.net/dnscheck/

This service actually makes the queries while you wait and shows you every one. If anyone can find a query on this page that doesn't work, I'd be very interested in seeing it. You can check the MX for cesmail.net and also the A record for mx.cesmail.net using this page.

JT

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I'm currently getting the following from SSW. I'll let you know if it changes.

11/08/04 23:06:48 dig cesmail.net [at] 216.175.203.50

Dig cesmail.net[at]dns5.name-services.com (212.118.243.118) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net MX (Mail Exchanger) Priority: 5 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 10 mx2.cesmail.net

  cesmail.net SOA (Zone of Authority)

        Primary NS: dns1.name-services.com

        Responsible person: info[at]name-services.com

        serial:2002050701

        refresh:10001s (20 hours)

        retry:1801s (300 minutes)

        expire:604801s (70 days)

        minimum-ttl:181s (30 minutes)

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  dns1.name-services.com A (Address) 63.251.163.102

  dns2.name-services.com A (Address) 216.52.184.230

  dns3.name-services.com A (Address) 63.251.83.36

  dns4.name-services.com A (Address) 64.74.96.242

  dns5.name-services.com A (Address) 212.118.243.118

Dig cesmail.net[at]dns4.name-services.com (64.74.96.242) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net MX (Mail Exchanger) Priority: 5 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 10 mx2.cesmail.net

  cesmail.net SOA (Zone of Authority)

        Primary NS: dns1.name-services.com

        Responsible person: info[at]name-services.com

        serial:2002050701

        refresh:10001s (20 hours)

        retry:1801s (300 minutes)

        expire:604801s (70 days)

        minimum-ttl:181s (30 minutes)

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  dns1.name-services.com A (Address) 63.251.163.102

  dns2.name-services.com A (Address) 216.52.184.230

  dns3.name-services.com A (Address) 63.251.83.36

  dns4.name-services.com A (Address) 64.74.96.242

  dns5.name-services.com A (Address) 212.118.243.118

Dig cesmail.net[at]dns3.name-services.com (63.251.83.36) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net MX (Mail Exchanger) Priority: 5 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 10 mx2.cesmail.net

  cesmail.net SOA (Zone of Authority)

        Primary NS: dns1.name-services.com

        Responsible person: info[at]name-services.com

        serial:2002050701

        refresh:10001s (20 hours)

        retry:1801s (300 minutes)

        expire:604801s (70 days)

        minimum-ttl:181s (30 minutes)

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  dns1.name-services.com A (Address) 63.251.163.102

  dns2.name-services.com A (Address) 216.52.184.230

  dns3.name-services.com A (Address) 63.251.83.36

  dns4.name-services.com A (Address) 64.74.96.242

  dns5.name-services.com A (Address) 212.118.243.118

Dig cesmail.net[at]dns2.name-services.com (216.52.184.230) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net MX (Mail Exchanger) Priority: 5 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 10 mx2.cesmail.net

  cesmail.net SOA (Zone of Authority)

        Primary NS: dns1.name-services.com

        Responsible person: info[at]name-services.com

        serial:2002050701

        refresh:10001s (20 hours)

        retry:1801s (300 minutes)

        expire:604801s (70 days)

        minimum-ttl:181s (30 minutes)

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  dns1.name-services.com A (Address) 63.251.163.102

  dns2.name-services.com A (Address) 216.52.184.230

  dns3.name-services.com A (Address) 63.251.83.36

  dns4.name-services.com A (Address) 64.74.96.242

  dns5.name-services.com A (Address) 212.118.243.118

Dig cesmail.net[at]dns1.name-services.com (63.251.163.102) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net MX (Mail Exchanger) Priority: 5 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 10 mx2.cesmail.net

  cesmail.net SOA (Zone of Authority)

        Primary NS: dns1.name-services.com

        Responsible person: info[at]name-services.com

        serial:2002050701

        refresh:10001s (20 hours)

        retry:1801s (300 minutes)

        expire:604801s (70 days)

        minimum-ttl:181s (30 minutes)

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  dns1.name-services.com A (Address) 63.251.163.102

  dns2.name-services.com A (Address) 216.52.184.230

  dns3.name-services.com A (Address) 63.251.83.36

  dns4.name-services.com A (Address) 64.74.96.242

  dns5.name-services.com A (Address) 212.118.243.118

Dig cesmail.net[at]216.175.203.50 ...

Non-authoritative answer

Recursive queries supported by this server

Query for cesmail.net type=255 class=1

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns3.name-services.com

  cesmail.net NS (Nameserver) dns4.name-services.com

  cesmail.net NS (Nameserver) dns5.name-services.com

  cesmail.net NS (Nameserver) dns1.name-services.com

  cesmail.net NS (Nameserver) dns2.name-services.com

  dns4.name-services.com A (Address) 64.74.96.242

  dns5.name-services.com A (Address) 212.118.243.118

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In this case, nslookup is useless. You're not querying the authoritative nameservers, you're querying your own DNS cache.

Implementation perhaps? On this iBook, OS-X (FreeBSD derived) I can specify the server to be queried.

nslookup [-option ...] [host-to-find | -[server]]

host [server] --- look up information for "host" using the current default server or using [server] if specified.

This is what I was talking about earlier, trying to check the NS of the posters with issues. Running into other wierd stuff .. my ISP for instance defers to AT&T NS, and only two of them have been responding this afternoon continuously, two have been off more than on, and one has not connected all day.

On the other hand, while playing around, I have just trashed omething "important" on this danged iBook ... back in a bit <g>

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In this case, nslookup is useless. You're not querying the authoritative nameservers, you're querying your own DNS cache.

Useless for YOUR purposes, Jeff...but meaningful for that particular host when it goes looking for "cesmail.net" to send it some mail. Of course I knew that it was only local...I said so.

The third-party tool is the same problem. Sure, it says there's a problem. It says there are no A records. When did it query the nameservers?

It does it in real time...that's why the page is gradually assembled.

Which nameservers did it query?

All of them.

I'll take a look at Squish, but in the meantime, there's a problem with the reverse DNS for the MX for "cesmail.net":

http://www.dnsstuff.com/tools/ptr.ch?ip=216.154.195.53

"there are no PTR records for 216.154.195.53"

and also a problem with the other IP:

http://www.dnsstuff.com/tools/ptr.ch?ip=216.154.195.36

Answer:

216.154.195.36 PTR record: mailgate.cesmail.net. [TTL 86400s] [A=None] *ERROR* A record does not point back to original IP.

I know that you're asking us to catch one of the DNS servers misbehaving, but perhaps this points to basic problems with the configuration, and not necessarily with an occasional glitch on one of the servers.

DT

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I just ran some more queries and it looks like the DNS services for "cesmail.net" have been moved from "name-services.com" to "zoneedit.com" but the SAME problems are still there...."ERROR: None of your mail server(s) seem to have reverse DNS (PTR) entries"

It would seem that the DNS config hasn't been changed...but simply moved. I don't think that's going to solve the whole problem if changes to the way the DNS records are configured aren't also made.

DT

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... and now, the new DNS provider:

11/09/04 00:33:37 dig cesmail.net [at] 216.175.203.50

Dig cesmail.net[at]ns13.zoneedit.com (216.122.4.160) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

  cesmail.net SOA (Zone of Authority)

        Primary NS: ns6.zoneedit.co.uk

        Responsible person: soacontact[at]zoneedit.com

        serial:1099966601

        refresh:14400s (4 hours)

        retry:7200s (2 hours)

        expire:950400s (11 days)

        minimum-ttl:7200s (2 hours)

  cesmail.net MX (Mail Exchanger) Priority: 0 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 5 mx2.cesmail.net

  cesmail.net A (Address) 0.0.0.0

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

Dig cesmail.net[at]ns6.zoneedit.co.uk (217.160.131.209) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

  cesmail.net SOA (Zone of Authority)

        Primary NS: ns6.zoneedit.co.uk

        Responsible person: soacontact[at]zoneedit.com

        serial:1099966601

        refresh:14400s (4 hours)

        retry:7200s (2 hours)

        expire:950400s (11 days)

        minimum-ttl:7200s (2 hours)

  cesmail.net MX (Mail Exchanger) Priority: 0 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 5 mx2.cesmail.net

  cesmail.net A (Address) 0.0.0.0

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

Dig cesmail.net[at]ns17.zoneedit.com (209.126.159.118) ...

Authoritative Answer

Query for cesmail.net type=255 class=1

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

  cesmail.net SOA (Zone of Authority)

        Primary NS: ns6.zoneedit.co.uk

        Responsible person: soacontact[at]zoneedit.com

        serial:1099966601

        refresh:14400s (4 hours)

        retry:7200s (2 hours)

        expire:950400s (11 days)

        minimum-ttl:7200s (2 hours)

  cesmail.net MX (Mail Exchanger) Priority: 0 mx.cesmail.net

  cesmail.net MX (Mail Exchanger) Priority: 5 mx2.cesmail.net

  cesmail.net A (Address) 0.0.0.0

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

Dig cesmail.net[at]216.175.203.50 ...

Non-authoritative answer

Recursive queries supported by this server

Query for cesmail.net type=255 class=1

  cesmail.net NS (Nameserver) ns17.zoneedit.com

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns13.zoneedit.com

  cesmail.net NS (Nameserver) ns17.zoneedit.com

  cesmail.net NS (Nameserver) ns6.zoneedit.co.uk

  ns6.zoneedit.co.uk A (Address) 217.160.131.209

  ns13.zoneedit.com A (Address) 216.122.4.160

  ns17.zoneedit.com A (Address) 209.126.159.118

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I just ran some more queries and it looks like the DNS services for "cesmail.net" have been moved from "name-services.com" to "zoneedit.com" but the SAME problems are still there...."ERROR: None of your mail server(s) seem to have reverse DNS (PTR) entries"

It would seem that the DNS config hasn't been changed...but simply moved. I don't think that's going to solve the whole problem if changes to the way the DNS records are configured aren't also made.

DT

19813[/snapback]

dnsreport.com is wrong

I don't know what else to say. They aren't updating information or the web page is broken. The DNS is fine. I've checked it and multiple other DNS tools all say it's fine.

http://www.dnsstuff.com/tools/traversal.ch...mail.net&type=A

JT

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There are still demonstrable problems here, JT. For example, connections to mx.cesmail.net, which is the preferred MX, keep timing out. I'm running manual tests like this:

$ telnet mx.cesmail.net 25

and it ges stuck at:

Trying 216.154.195.36...

because the server isn't answering. Then I try again and it answers. That's also happening with mx2.cesmail.net.

I don't think that DNSReport.com is using cached information, because the results differe when run multiple times. In fact, it sometimes is pulling up the same IP address for both the MX's, which then results in errors.

According to the reverse DNS tool at "DNSStuff.com" there are still problems with the reverse DNS for 216.154.195.53:

http://www.dnsstuff.com/tools/ptr.ch?ip=216.154.195.53

DT

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DT, what happens when you try to telnet directly to 216.154.195.36 and 216.154.195.53 on port 25? From here, I'm not getting a connection to 216.154.195.36 at present, and 216.154.195.53 took forever to respond to "RCPT TO:<bogusnnnnn[at]spamcop.net>" where nnnnn is a random 5-digit number.

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I am unable to access either webmail.spamcop.net or webmail.cesmail.net.

I was unable to download any e-mail via Eudora which I use. I went into the properties file and changed the server name from pop.spamcop.net to mail.spamcop.net. I am now able to retreive e-mail but still cannot access webmail. :huh:

What is going on?

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