It looks like your httpd server is doing a redirect to your internal IP address,
which it thinks is it?s ServerName. Don?t think NAT has anything to do with it.
Daniel
> On 29.09.2016 ?., at 15:47, O. Hartmann <ohartman at
zedat.fu-berlin.de> wrote:
>
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> Despite other problems with IPFW and its documentation regarding NAT, I
face a serious
> and disturbing problem.
>
> I run a NanoBSD based router/firewall project of my own, running CURRENT
(FreeBSD
> 12.0-CURRENT #1 r306333: Mon Sep 26 08:36:02 CEST 2016). IPFW is the filter
of my choice,
> since it is FreeBSD's native. I also use In-kernel-NAT as well as
pppoed/ppp. The modem
> is connected to a dedicated NIC, the pppoe-traffic is transported via tun0
- I think this
> is the usual stuff.
>
> The IPFW has this NAT rule:
>
> ${fwcmd} nat 1 config if ${if_isp0} \
> log \
> reset \
> same_ports \
> redirect_port tcp ${server_gate}:22 22 \
> redirect_port tcp ${server_www}:80 80 \
> redirect_port tcp ${server_www}:443 443 \
> redirect_port tcp ${server_refdb}:9734 9734
>
> server_www is assigned to a non-official IP, 192.168.10.10.
>
> if_isp=tun0, tun0's IP is given by the provider, I use net/ddclient as
the updater for a
> dynamic DNS account.
>
> I use an internal DNS server, which resolves 92.168.10.10 to a certain
name. I also use
> self signed SSL certicates, just for completeness of this information.
>
> Connecting from the outside world to my dynDNS domain triggers Firefox or
any other
> browser to compalin about the self signed SSL certificate - as usual, but
then, adding
> it, suddenly the domain name (say: www.blabla.org) is replaced by the
internal IP I
> delegate any access on ports 80 and 443 to.
>
> What happens here? I consider this a bug, I never saw this on our Linux
servers running a
> similar setup (forwarding, BIND 9.10/BIND 9.11).
>
> Thanks,
>
> Oliver
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