Comcast PRO And RDNS
May 7, 2008
I have Comcast Business PRO Internet service for work purposes. I've got two web/dns servers and two mail servers, each having their own IP. These are all fine.
There had been a couple situations in the past where I would receive a "Relaying Denied" message from my PINE when sending mail out. At examination of the maillog, It's essentially telling me that these messages are being generated because of the lack of reverse DNS.
xxx.xxx.xxx.xxx-Oregon.hfc.comcastbusiness.net., instead of my.domain.com.
I did a couple searches on Google, and read somewhere that Comcast is unwilling to create rDNS entries, but they've not specified, so far, whether they subscribe to PRO or residential service.
Before I spend 90 minutes on the phone with Comcast, I thought I'd see if anybody here has been successful with rDNS and Comcast PRO before. It seems to me that by denying this, it defeats the purpose of the "dedicated" service that I signed up with ...
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Sep 24, 2009
We're having a meeting today with Comcast about letting them move fiber into our facility. Please do not post experiences with Comcast CABLE. I want to know your experience as other datacenters and hosts with Comcast Fiber. What do you know about their fiber and what is your experience with them in both standalone and BGP?
Reliability, latency, peering quality, etc. We are in the Houston area, where so far I have heard they are pretty good with most I have talked to, and a few negatives. At what level would you use their connection?
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Jul 14, 2009
Are there any co-location companies in California (preferably northern) that have a peering agreement directly with Comcast?
Not sure if it's peering or transit I should be asking about. Basically I'm trying to get the best path I can afford to Comcast customers in California.
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Jul 1, 2008
it looks like FDC is taking more pain than usual in terms of network upgrade, i see the network seems unstable till 5am and even now the sessions are getting lost, once in a while like once a hr, anyway this is not the reason i am writing this, but when did comcast become transit provider, i did a trace to UK for example and i see trace going through comcast and then hopping onto tiscali/level3, it looks to me like, comcast could be trying to even out (1:1) it;s carriers so that they get all inbound for free sort of and it;s upstream selling as a transit make money there. sort of, just a surprise to me at this point
2 <1 ms <1 ms <1 ms 66.90.127.141 [66.90.127.141]
3 1 ms 1 ms 1 ms be-10-604-cr01.chicago.il.ibone.comcast.net [68.
6.89.49]
4 37 ms 40 ms 36 ms pos-1-14-0-0-cr01.newyork.ny.ibone.comcast.net [
8.86.85.105]
5 42 ms 42 ms 42 ms pos-1-15-0-0-cr01.mclean.va.ibone.comcast.net [6
.86.85.89]
6 30 ms 30 ms 31 ms xe-3-1-0.was11.ip.tiscali.net [213.200.84.117]
7 122 ms 115 ms 113 ms xe-2-1-0.par70.ip.tiscali.net [89.149.186.165]
8 119 ms 119 ms 119 ms kpn-eurorings-gw.ip.tiscali.net [213.200.85.238]
9 120 ms 120 ms 123 ms asd2-rou-1021.NL.eurorings.net [134.222.231.177]
10 119 ms 119 ms 167 ms obl-rou-1021.NL.eurorings.net [134.222.231.130]
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Apr 28, 2008
I have a business class comcast account and have been able to host multiple sites on my server but ive recently read strange things about comcast's regulations towards this.
there really arent any alternatives in my area for a connection and i have multiple accounts right now. has anyone had any bad experiences in this situation?
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Jan 24, 2008
San Francisco to Ashburn
3 * 137 ms 111 ms ge-2-20-ur01.santaclara.ca.sfba.comcast.net [68.
86.143.145]
4 * 39 ms 89 ms pos-0-7-0-0-ar01.sfsutro.ca.sfba.comcast.net [68
.86.90.154]
5 * 289 ms 17 ms pos-0-9-0-0-cr01.sanjose.ca.ibone.comcast.net [6
8.86.85.130]
6 645 ms 95 ms 76 ms pos-0-9-0-0-cr01.denver.co.ibone.comcast.net [68
.86.85.118]
7 843 ms 111 ms 262 ms pos-0-10-0-0-cr01.chicago.il.ibone.comcast.net [
68.86.85.54]
8 124 ms 100 ms 114 ms pos-0-3-0-0-cr01.cleveland.oh.ibone.comcast.net
9 167 ms 125 ms 225 ms
pos-0-6-0-0-cr01.pittsburgh.pa.ibone.comcast.net
[68.86.85.42]
10 156 ms 108 ms 164 ms te-0-4-0-7-cr01.mclean.va.ibone.comcast.net [68.
86.84.93]
11 113 ms 192 ms 107 ms te-1-1-pr01.ashburn.va.ibone.comcast.net [68.86.
84.94]
12 188 ms 233 ms 112 ms xe-3-1-0.was11.ip.tiscali.net [213.200.84.117]
San Francisco to Santa Clara
6 87 ms 60 ms 75 ms sar1.sffca.ip.att.net [12.123.12.121]
7 57 ms 61 ms 52 ms te-0-3-0-0-ar01.sfsutro.ca.sfba.comcast.net [68.
87.226.185]
8 67 ms 79 ms * ge-2-20-ur01.santaclara.ca.sfba.comcast.net [68.
86.143.145]
9 176 ms 142 ms 129 ms ge-2-20-ur01.santaclara.ca.sfba.comcast.net [68.
86.143.145]
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Mar 29, 2007
For some reason... No one with a Comcast.net email address can email us..
Always the Rejected Email comes back with This message:
==============================================================
A message (from <yyyyyyy@comcast.net>) was received at 29 Mar 2007 3:15:15 +0000.
The following addresses had delivery problems:
<yyyyy@sellwebhost.com>
Permanent Failure: 550-Callback_setup_failed_while_verifying_<yyyyyyy@comcast.net>
Delivery last attempted at Thu, 29 Mar 2007 03:15:18 -0000
=============================================================
I have used "yyyyyyy" only to alter the email address for privacy..
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Jul 14, 2009
Both have a nationwide backbone, ibone for Comcast and tbone for Road Runner. Which one is bigger and does anyone have a network map?
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May 24, 2008
I find it very interesting that the major ISPs in and around Portland Oregon apparently do not peer with anyone in the region. For low latency you're better off choosing a provider in Seattle or San Jose as traffic always seems to be routed there and back anyways.
Why is this? Is it simply not worth their effort to setup the peering connections because most traffic will be hosted outside the region anyways?
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Jun 20, 2008
Is anyone else having a large number of Comcast email addresses being bounced back?
We found that it started two weeks ago and is spreading to other Comcast addresses that were previously working.
If you have received info on this or if it is happening to your network as well,
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Apr 15, 2009
I've recently gotten a new dedicated server and am in a bit of a bind because all emails to Comcast are blocked. I have verified that the IP is not on any RBL I can find but it does appear on the Trend Micro DUL list. This is a list that appears to not be maintained but which the wingnuts at Comcast are using. Emails to the maintainer of the list or to Comcast are auto-responded to and promptly ignored.
I'm at wits end (admittedly, not a long journey) with this. As a small provider I guess I just don't count but it is annoying as hell that there is no way to get these folks to listen. Every legitimate RBL on the planet has someone to help with issues but Trend Micro appears to not. And Comcast doesn't care about their customers getting legitimate email. Actually, I guess they just don't care period.
Has anyone else experienced this and, if so, were you able to figure out what magical incantation it takes to get through to a human who cares?
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Dec 3, 2008
I just read this on their forums.Softlayer is pleased to announce that we have turned up a private 10G peer with Comcast in Dallas. This will bring our total capacity in Dallas to 70Gs.
Dallas, TX (dal01) - 70Gs
Verio - 20G (2x 10G)
Level3 - 10G
Savvis - 10G
Global Crossing - 10G
Internap - 10G
Comcast - 10G private peering Which other providers have this?
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Nov 7, 2008
It appears Comcast is now blocking port 25. As a result, I can't sent outbound email via my dedicated server. They had me change to port 587 for my comast email account, but that doesn't solve my not being able to send outbound from my dedicated server.
Is there anythighn I can do (like change the post my mail server uses to 587) so that I can send outbound mail from my server with outlook (over Comcast connection) or am I just stuck now with using web mail?
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Apr 11, 2008
I think this is related to rDNS.
[url]
If you take a look at URL above, the lookup for the IP leads to nsmx.net where as the lookup for nsmx.net leads to another IP.
The IP should resolve to host6.nsmx.net, how am i supposed to fix that?
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Sep 22, 2007
i cant sent emails to Hotmail from my domains so make a Spam Database Lookup from dnsstuff for my main ip 72.249.101.164
here are the results
"72.249.101.164 has no reverse DNS entry; some mail servers may not accept your mail."
and i also not listed to any database.
Can someone check the and tell me if
- RDNS are ok
- and if this spam databases include Hotmai spam databases?
My hosting provider tell me that RDNS are ok and that Hotmail black listed the server IP
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May 27, 2008
I was told by the data center NOC that I can manually handle rdns/ptr requests myself, as long I do the below.
Set up your name servers to respond to the reverse dns inquiries that we would forward to you.
Can anyone shed light on this? What if someone requests rdns on 32 IP's in one shot for example, how would you go about doing this?
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Jan 15, 2008
I set rdns by contacting the dedicated server host. I am switching to a colo environment soon, do I still contact the ISP who issues the IPs for the rdns requests or can I set them myself somehow on my servers?
If I eventually get my own IPs through ARIN, how do I set rdns? Do I just get some script to set the PTR records on my own servers?
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Nov 8, 2008
Im configured domainkey, spf and rdns exactly on my server, but my outgoing email to yahoo is spam too.
My sent email to yahoo (Header): ....
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May 16, 2007
I have two ISP lines coming to my router which is connected to a Exchange mail server. Both ISP has given me dedicated IP addresses such as:
ISP1 = 217.105.25.94
ISP2 = 62.15.125.44
Now my ISP1 IP address has a reserve DNS set and when the mails are send via this line no problem, but my ISP2 IP does not have a reverse DNS so some mails are bouncing back due to the face the receiving mail server is checking the IP against the DNS.
How can I solve this issue, or normally who can set this rDNS?
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Nov 15, 2007
Just got set up with a new VPS and while looking to see if my IPs were blacklisted, I came across a RDNS warning. I've been on some form of shared hosting since I've been on the Internet, so much of the VPS stuff is new to me (though it is managed). Everything I've read says that RDNS is important for sending mail so the receiving end can verify where mail is coming from, but I thought I would ask here regarding my specific issue.
I've got four IPs on my account. The first ip, x.x.x.67, is the host IP(ie host.example.com). Most of my domains are using that IP at the moment since I just got set up, but I do have another domain on the last IP in my account, x.x.x.70. When I first did a RDNS check on my main IP I got a domain that I've never seen before, and all other IPs on my account don't resolve at all.
I sent a ticket off to the host, and they set the RDNS record correctly for the main IP on my account, but the other three still fail to resolve. When I asked the host about it in a ticket, the response that I got was
Quote:
Normally, we set RDNS for the main IP address to hostname of the server.
The RDNS for your server has been setup properly. Please get back to us if you need any further assistance.
So basically I'm clueless. Does it matter that the other three IPs I have available don't resolve at all? The domain on the x.x.x.70 IP, which doesn't resolve, is an e-commerce site that depends almost exclusively on e-mail for its business. Doesn't the lack of RDNS resolution mean that I'll be out of luck sending mail to AOL, Yahoo, Hotmail, etc etc on that account? Even though I don't have sites on the middle two IP addresses yet, I fully plan to put sites there within the next couple of months... could they have the same problem?
It's frustrating since I obviously have no control over RDNS records, and the host's staff is being a little obtuse about it.
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Sep 20, 2007
my host won't do it for me, they said I have to do it myself... Is there anyway you guys can show me how to reverse dns in centos?
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Apr 2, 2008
I was wondering if anyone could assist me on how to setup RDNS?
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Mar 19, 2008
active reverse DNS in web host manager as i keep getting emails bouncing back etc.
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Jul 9, 2008
This is the output at RIPE NCC's web update interface:
***Info: Authorisation for parent [inetnum] 193.53.87.0 - 193.53.89.255
using mnt-domains: authenticated by: ITECH-MNT
***RDNS: (related to ns1.infinitetech.in, ns2.infinitetech.in) ERROR (20 points):
Could not get an SOA record from ns1.infinitetech.in, ns2.infinitetech.in (193.53.87.2).
***RDNS: (related to set) ERROR (20 points):
The IP address 193.53.87.2 is identical for the nameserver(s) ns1.infinitetech.in, ns2.infinitetech.in found in the submitted domain object.
***Error: There are 20 or more problem points. Delegation was not successful.
This is what I am trying to submit:
domain: 87.53.193.in-addr.arpa
descr: Reverse Delegation for Infinite Technologies
admin-c: ITGR-RIPE
tech-c: ITGR-RIPE
zone-c: ITGR-RIPE
mnt-by: ITECH-MNT
nserver: ns1.infinitetech.in
nserver: ns2.infinitetech.in
changed: noc@infinitetech.in 20080101
source: RIPE
password: secret_here
Following the guide available at:
[url]
Now, how do I create the SOA record on a cPanel based server? I created a new zone, rdns.infinitetech.in and now what? I don't see SOA record option at all in the drop down list!
Unless I misunderstood what an SOA record is, I have no idea how to implement rDNS. Anyone?
If any RIPE NCC member/participant is available to answer this question directly it would be awesome! Others, give it your shot - I do understand that most of you are ARIN members/participants.
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Nov 13, 2007
It seems our rDNS database is not responding to the PTR record. its on a cpanel server
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Jan 25, 2008
This is an issue I've been having for a few months now and haven't been able to resolve yet with my data center, AOL support and the company who manages the server for me. My main reason for posting this is for a fresh set of eyes and to see if anyone else has had a similar problem in the past (and how they fixed it)
The issue is this:
I set up a dedicated server to host my web design clients a few months back and no one has been able to send to or receive mail from AOL addresses. I've gone through everything at the postmaster.aol.com site and have ensured that reverse DNS records are in place for all IPs associated with the server, as rDNS is a mandatory requirement for AOL.
Once my support requested was finally elevated to a real AOL support tech, they confirmed that my IP was not being blocked by their servers and are still under the impression that the problem must be on my end somewhere. Because this problem only occurs with AOL (we can send/receive with all other big providers - yahoo, hotmail, gmail, hush, etc), my server management team are fairly certain it must be an issue on AOL's side.
When sending mail from an AOL address, it bounces back with an error like so (real emails replaced with example addresses):
451 <email@exampledomain.com>... exampledomain.com: Name server timeout
Message could not be delivered for 2 hours
Message will be deleted from queue
When sending mail from my server, it bounces back with an error like so:
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
exampleaddress@aol.com
retry timeout exceeded
When attempting to manually deliver a message to AOL from the Mail Queue in WHM, I get an error like so:
Message xxx-example-number is not frozen
delivering xxx-example-number
Connecting to emr-d01.mx.aol.com [205.188.159.2]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
emr-d01.mx.aol.com [205.188.159.2] Connection timed out
Connecting to emr-m01.mx.aol.com [64.12.136.169]:25 ... failed: Connection timed out (timeout=5m)
LOG: MAIN
emr-m01.mx.aol.com [64.12.136.169] Connection timed out
LOG: MAIN
== example@postmaster.aol.com R=lookuphost T=remote_smtp defer (110): Connection timed out
When attempting a manual telnet test from my server to AOL's mail server at , it also times out with the following:
Trying 64.12.137.184 (connection timed out)
Trying 205.188.156.248 (connection timed out)
Trying 205.188.159.57 (connection timed out)
telnet: Unable to connect to remote host: Connection timed out
The AOL support tech explained that if my server IP were being blocked, it would return messages with a block error code instead of timing out. They suggested my firewall was blocking AOL's server....but both my data center and server management company said that isn't the case.
Because I can't duplicate this problem with anyone but AOL accounts, I don't know what else to troubleshoot or look for. I know AOL is notorious for blocking IPs and most email related problems are usually for lack of rDNS, but neither of those issues are the problem in this situation...so I don't know what else to try. My server management company (PSM) and AOL (once they finally elevated me to a real tech support person), have been very patient and helpful....but we still haven't been able to identify the problem and I feel incompetent for not being able to contribute on my own. I've researched for weeks and certainly understand more than I did, but still far less than they do.
AOL did direct me to a Windows Server troubleshooter relating to UDP packet size limitations with some firewalls that could cause MX query timeouts with AOL, Earthlink and Quest...but because I'm on an Apache server...I didn't know if that could be related at all to my issues (not to mention that I didn't even know what any of that meant until I went and looked up what a UDP packet actually was. I'm still not entirely sure I understand it). Even so, I did send the information to Platinum Server Management a short while ago, but haven't heard back yet.
Anyways.... in the meantime, I thought I'd check here in case anyone else had the same issue or saw something obvious we might not be considering.
My server details are as follows. I included my data center and management company details to illustrate that people far more qualified and intelligent than myself have performed the most common and obvious troubleshooters so far:
Pentium IV 2.8GHz /1GB DDRAM /120GB EIDE HDD
OS: CentOS 4.3
cPanel/WHM
Main Server IP: 66.79.163.138
Example Domain on the server: vedadesigns.net
Data Center: Dediwebhost.com (awesome service & fast support)
Initial Server Setup & Management: Platinum Server Management (I just can't say enough good things about these people)
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Sep 6, 2007
I don't know much about technical details of mail servers. But i want to discuss a serious problem i am facing now. I have a reseller account with jodohost. I am not a reseller but i need this to host 20 of my own and client sites. During last few days no. of emails coming to us dropped almost 60% and suddenly i found that i was not getting emails from few of my clients. Then today i got a call from two of them and they said that all emails they were sending to me, were bouncing back.I asked them for a copy of bounced emails which they sent to my gmail account and i forwarded it to my jodohost support. This the response i got-
All of our mail servers have reverse DNS and mails are delivered. anyone not having rDNS is not able to mail much of the internet already, they really must talk to their system administrators and get reverse DNS setup.
Now they say that my clients do not have rdns at their mail servers and emails from them can not be delivered to my account.
Is rdns compulsory to send emails from a mail server these days?
But in that case i may not get emails from so many inquires?
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Oct 11, 2007
i have a cpanel dedicated server.
I have a problem with a client whose mails are getting rejected because it fails rdns check, can any one tell me how to add this domain in Exim's whitelist so that the mail is sent/recieved even if rdns or any other checks fail.
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