Thank you for your reply . Sorry that I was not exact on my previous message . Actually , my CentOS host is @172.18.98.1 and the network element is @ 172.18.0.1 . To this end , my host can ping the network element but when I try to scan its ports to see which one is open the nmap cannot distinguish and returned the message that I sent you . I hope this clarifies my situation here . On Tue, Sep 29, 2009 at 12:26 PM, Bastian Ballmann <bb at patronas.de> wrote: > hadi motamedi schrieb: > > Thank you for your reply . But still it cannot get through : > > " > > #nmap -sS -p 20-80 172.18.0.1 > > Starting nmap V. 3.00 ( www.insecure.org/nmap/ > > <http://www.insecure.org/nmap/> ) > > Note: Host seems down. If it is really up, but blocking our ping > > probes, try -P0 > > I dont know your network structure, but in your last email it sounds if > you could ping the host and now it looks like you're dropping everything? > > iptables -P INPUT ACCEPT > > This will allow all input to your host. > > HTH & Greets > > Basti > > -- > Bastian Ballmann > > PATRONAS Financial Systems GmbH > Schnewlinstr 4 > 79098 Freiburg > > fon +49 (0)761 400688-19 > fax +49 (0)761 400688-50 > > ballmann at patronas.de > http://www.patronas.de > > Amtsgericht Freiburg, HRB 7212 > Geschäftsführung: Heribert Steuer, Carsten Osswald > > This e-mail may contain confidential and/or privileged information. If you > are not the intended recipient (or have received this e-mail in error) > please notify the sender immediately and destroy this e-mail. Any > unauthorized copying, disclosure or distribution of the material in this > e-mail is strictly forbidden. > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20090929/e53cad41/attachment-0004.html>