Forwarding not work in FC9 but ip forward is turn on

[ppps]

Hey guys,
first of all I would like to thank them for their great support, thanks to that I could now bring forward a package from both ends, or for any network, except for one detail. The 192.168.5.0 network is supported by a router zyxell Prestige 660-Hw T1-V2, that give me access to the Internet.
Through this router I can reach computers behind the router zxyell (example: from 192.168.5.20 to 192.168.1.210 via linux FC9), but unfortunately from 192.168.1.210 I can not ping the interface of the router ZyXEL (IP: 192,168 .5.1). But if I can ping from 192.168.5.254 (linux FC) to 192.168.5.20 (as mentioned above). This is quite strange to me :( . I mean
Pinging 192.168.1.210  192.168.5.1 does NOT WORK! :(
Pinging 192.168.5.254  192.168.5.1 if it works!
192.168.5.20 Pinging  192.168.5.1 also works

I called my ISP and I asked for some filter on the router itself that prevents the ping, but they say that with the default settings there is no filter that blocks access to the interface. I even reset the router ZyXEL to the default values but does not work.
My supplier tells me that there is something in linux known as an "echo" in which I turn off my linux FC but who have no idea how to do it. :(

I need to access my LAN to the Internet but I can only do that from the hosts directly connected to the router zyxell (including FC), but not from my other lamentablmente LANS :(

Please I need your support and thank you very much in advance!!


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