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#265431 21-Jan-2020 13:34
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The company I work for implemented a remote monitoring system over cellular some years ago, and as we have a low-powered CPU we wanted an APN which blocked incoming connection attempts.


We started experimenting with "" which did have incoming unsolicited traffic, but at some point during development the incoming traffic abruptly stopped and we figured that VF had turned the switch off and kept using that APN.


Recently while debugging a different fault I looked at the PPP traffic and found that the device was fielding incoming TCP connection attempts from random IP addresses in France etc. and a UDP packet from "" supposedly in the USA.


Has this been an official behaviour change by VF? The ancient sticky for Vodafone APNs doesn't mention "", although it is supposedly the default according to other posts, and other posts seem to imply this APN blocks incoming traffic.


NAT isn't a problem because we only make outgoing TCP connections.


Should we be using a different APN? If so, what ? Searching GZ hasn't really shed any light, although I have tried a few search terms.


Thanks, Len.

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  #2402971 21-Jan-2020 13:47
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You should just use ' vodafone '


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  #2402980 21-Jan-2020 15:12
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Vodafone uses CG-NAT so incoming traffic shouldn't be possible now? Or am I mistaken? Last time I tried - was definately CG-NAT on their 4G network.

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  #2402981 21-Jan-2020 15:14
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I'm sure the 4G network is not CG NAT but inbound traffic is blocked on the VodafoneNZ firewall to the mobile network

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  #2403008 21-Jan-2020 15:58
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I just checked a 3G connection using 'vodafone' and has 100.120.x.y address.


And the work I've done with on account SIMs in 4G cards in my little servers have all shown CG-NAT addresses on the interface. I've found that I had to set the APN = null using QMI interface.

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  #2408293 28-Jan-2020 16:16
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Thanks very much for your help.


Perhaps the post "Vodafone Mobile APN list" at which is dated 2006 could be tagged with "Still correct at Jan 2020" or similar as I sort-of discounted it due to the age of the post, and the only mention of the "" APN being "Since the '' addressing has now been changed to public IP's" which is no longer true.

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