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NAT: cannot access official IP from internal Net

Hi,

I have a new astaro installation:

Internal Network: 192.168.252..0
External Address (example): 20.20.20.20

I create a DNAT roule so it is possible to access the external IP from the Internet (HTTP and Jabber), this works perfect. But if i try to access the external Address from the internal network it fails.

A ping: 

dennis@dennis:~$ ping 20.20.20.20
PING 20.20.20.20 (20.20.20.20) 56(84) bytes of data.
64 bytes from 192.168.252.20: icmp_seq=1 ttl=128 time=0.340 ms
64 bytes from 192.168.252.20: icmp_seq=2 ttl=128 time=0.247 ms
64 bytes from 192.168.252.20: icmp_seq=3 ttl=128 time=0.289 ms

--- 62.68.249.236 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.247/0.292/0.340/0.038 ms

Any idea what could be the problem? I tried several SNAT roules but none of them worked.

Regards,
Dennis


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