help on network config

[stin wang]

I try to convert my work from windows to linux.

first install Ubuntu is so easy , thanks god.

now i can use Firefox, msn, and so on ,with proxy setting correctly

but my question is

my computer is used in subnet, configuration as follow

pc1
ip 172.18.20.87
mask 255.255.255.224
gate 172.18.20.94

the problem is described as follow:
there are other two pcs

pc2
172.18.20.98
255.255.255.224
172.18.20.126
pc3
172.18.20.225
255.255.255.224
172.18.20.253

i can ping 172.18.20.98 172.18.20.225 in pc1 ,it's ok
but i can't use ftp,vnc,or tsclient to pc2 or pc3, but it's ok for
172.18.20.88 which is in the same gateway as pc1,


what's wrong with it? how to figure out.

or just ubuntu have some problem with subnet??

i use ubuntu 7.10
-- 
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Tie Wang
TianJin Climate Center
TianJin Meteorological Bureau
Tianjin, China, 300074
Email: stin.wang at gmail.com
Tel:+86-22-23333559
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