You appear to be behind a NAT router.

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coconutdog
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Joined: 2010-11-21 00:53
First name: Matt
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You appear to be behind a NAT router.

#1 Post by coconutdog » 2017-05-12 05:33

Hi all. I'm trying to set up Filezilla server to serve Cisco & H3C routers and switched on my local inside secure subnet, I have no intention to use Filezilla to access the internet. I keep getting the following message:

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You appear to be behind a NAT router. Please configure the passive mode settings and forward a range of ports in your router.
Warning: FTP over TLS is not enabled, users cannot securely log in.
How do I get around this? Filezilla seems to think that I want to access the internet. The only nodes that will be accessing the FTP server are on 10.1.1.0/24. All the answers that I have found here talk about opening ports on my router which I have no intention of doing. I don't need secure TLS access, just plain old FTP. My H3C switch doesn't like TFTP which is what I usually use with Cisco gear to transfer IOS files etc.

Cheers,

Matt.

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botg
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Re: You appear to be behind a NAT router.

#2 Post by botg » 2017-05-12 07:21

You can ignore the NAT warning.

Note that you also want to use TLS inside your local network. Each device on your network can intercept and read traffic from every other device, even in a fully switched network thanks to ARP spoofing.

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coconutdog
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Re: You appear to be behind a NAT router.

#3 Post by coconutdog » 2017-05-12 12:13

Thanks botg. The warning is a bit misleading. Perhaps this needs to be reviewed and only pop up if you are trying to access an IP address only if it is outside a private allocation. What happens with IPv6 addresses?

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botg
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Re: You appear to be behind a NAT router.

#4 Post by botg » 2017-05-12 19:06

The warning does not appear if you do not have a private IPv4 address, e.g. if IPv4 is properly disabled.

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coconutdog
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Re: You appear to be behind a NAT router.

#5 Post by coconutdog » 2017-05-12 22:45

I'm not at all fussed about security, the application is for an autonomous lab like environment. Why would I want to disable IPv4? Some of my gear is legacy and doesn't support IPv6.

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botg
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Re: You appear to be behind a NAT router.

#6 Post by botg » 2017-05-13 07:45

Nice, you have devices that are over 22 years old. (IPv6 was first specified in 1995)

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