Newbie question

[Dante Sarmiento, IM]

Hello to all,   I can you me on this, when I try to port scan my network these information was revealed. (Scan was done outside the network)   Starting at: 09/14/00 15:07:12 192.xxx.xx.xxx - Active on 21 192.xxx.xx.xxx - Active on 23 192.xxx.xx.xxx - Active on 25 192.xxx.xx.xxx - Active on 53 192.xxx.xx.xxx - Active on 98 192.xxx.xx.xxx - Active on 110 192.xxx.xx.xxx - Active on 111 192.xxx.xx.xxx - Active on 113 192.xxx.xx.xxx - Active on 513 192.xxx.xx.xxx - Active on 514 192.xxx.xx.xxx - Active on 515 192.xxx.xx.xxx - Active on 995 192.xxx.xx.xxx - Active on 1024 Finished at: 09/14/00 15:08:13 Details for 192.xxx.xx.xxx on 21 are - 220 myserver.com FTP server (Version wu-2.6.0(1) Mon Feb 28 10:30:36 EST 2000) ready. Details for 192.xxx.xx.xxx on 23 are - ÿýÿý ÿý#ÿý' Details for 192.xxx.xx.xxx on 25 are - 220 myserver.com ESMTP Sendmail 8.9.3/8.9.3; Thu, 14 Sep 2000 15:18:55 +0800 Details for 192.xxx.xx.xxx on 98 are - 500 access denied: Check networking/linuxconf network access Details for 192.xxx.xx.xxx on 110 are - +OK Cubic Circle's v1.31 1998/05/13 POP3 ready <[EMAIL PROTECTED]> Details for 192.xxx.xx.xxx on 111 are - Details for 192.xxx.xx.xxx on 515 are - lpd: : Malformed from address Details for 192.xxx.xx.xxx on 995 are -   Is this means that my network is vulnerable to attack? If its vulnerable how can i prevent it? I'm using only ipchain on linux.   Thanks in advance.