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39 posts

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#57289 8-Feb-2010 16:30
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Hi there


I've been having issue connecting to our mail server, mainly with slow SMTP connections using iPhone over 3G on the Vodafone network. The issue is borne on both 3G and 2G. To make an authenticated connection with our SMTP/IMAP server takes up to two minutes to send a simple email with the word "test" !  So we looked at getting to the cause of the issue - .... hmmm - smell my finger - hmmm stinks of Vodafone....

After some delving, IP addresses are dynamically assigned when connecting to the Vodafone network with the iPhone. (Clearly i thought this would be the case).  After some more delving, these do not have a reverse DNS entry. Pardon me?  No PTR?  Meaning, you are now happily connect via Vodafone 3G, and you look like a spammer!  How brilliant. Grrrrrrr.....

Why cannot Vodafone provide PTR? Isnt it a fundamental and basic requirement of APNIC? Just a standard naming convention for its IP allocation for mobile devices would be good! Some PTR, any PTR, voices of Basil Faulty hitting car with branch - "your a naughty boy"

It could be as simple as 120-121-85-255.vodafone.co.nz  - standardised naming convention throughout is IP pool. 

I dont think im the only one with this issue - this would most likely apply to others running their own network or mail server, those who want to keep their IMAP mailbox folder structure intact.


Whats the story here Vofafone?  My mail server hates you, and right now so do i. Perhaps you could be more up with the play and less of behaving like a expensive draconian Nanna again.


Bravo !

Sam




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  #297103 8-Feb-2010 17:05
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I'm pretty positive Vodafone have reverse DNS entries, they may only exist on the internet APN (which is all I use). The normal vodafone.net.nz APN is a NAT'd IP range, internet is not behind NAT.

It's also worth noting that Telecom had issues with no reverse DNS lookups on XT as well.

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  #297110 8-Feb-2010 17:16
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This sounds a bit odd, why would your mail server care about whether your client device has a reverse dns record (or not) if you've made an authenticated connection to it?

 
 
 
 


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  #297111 8-Feb-2010 17:17
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Best APN is direct.vodafone.net.nz

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  #297117 8-Feb-2010 17:38
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The problem with the Internet APN (as I heard from someone) is that Vodafone has only a few (500 or so) public IP addresses available, while all other APNs are NATed. It was always intended for testing, so if you use Internet as the default APN you might not get connected at some stage due to overload since everyone seems to know about it.





 

 

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  #297132 8-Feb-2010 18:23
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Good information, thanks alot guys. The APN I was using was the default: www.iphone-vodafone.net.nz....
Now when i nslookup the newly assigned IP address, via the APN direct.vodafone.net.nz i get reverse entries, PTR records, and authoritive answers for the assigned IP. this is good. My send connection time is now 10-15 seconds.

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  #297138 8-Feb-2010 18:41
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Hope your finger smells better now



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  #297144 8-Feb-2010 18:45
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Haahhaa - good call.

 
 
 
 


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  #297146 8-Feb-2010 18:47
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johnr: Hope your finger smells better now


Yes, indeed a good call. People have to step back and first FIND the cause *AND THEN* go on calling companies... I see a lot of times here, on Twitter, on the streets people complaining about a company when the fault is lying somewhere else.




 

 

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  #297159 8-Feb-2010 18:59
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hehe - well i did phone Vodafone, spoke to the "technical team", and then their iPhone "specialists".

For the record - the post is the conclusion of a days work narrowing it down to the reverse DNS entries. Checking Exim mail logs etc. But thanks for the advice on the APN, all good.

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  #297161 8-Feb-2010 19:01
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Good. Now you know where to come to find the right answer ;-)






 

 

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  #297164 8-Feb-2010 19:03
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Thats for sure! I appreciate the input. :)

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  #297170 8-Feb-2010 19:16

XT should fix theirs too. Slingshot also has this problem on some of their IP ranges for home ADSL.

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  #297197 8-Feb-2010 21:14
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freitasm:
johnr: Hope your finger smells better now


Yes, indeed a good call. People have to step back and first FIND the cause *AND THEN* go on calling companies... I see a lot of times here, on Twitter, on the streets people complaining about a company when the fault is lying somewhere else.


Here is a perfect example poor 2D in this case

http://www.geekzone.co.nz/forums.asp?ForumId=85&TopicId=57288

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  #297418 9-Feb-2010 16:29
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samoir: Good information, thanks alot guys. The APN I was using was the default: www.iphone-vodafone.net.nz....


I am pretty sure www.iphone-vodafone.net.nz = internet APN it just has a different name for access control and billing but the access is exactly the same. It got an IP address from the same range last time i used it.




Any posts are personal comments and not that of my employer

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  #297422 9-Feb-2010 16:39
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iphone APN = www.vodafone.net.nz... APN

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