Problem with the configuration of the network

[the_virus]

Hello! From the start I have to say that I'm new to Linux (Fedora)...and i need some answers refering to network configuration. So, I've made the settings for my network (from the terminal), here is the output:

eth0 Link encap:Ethernet HWaddr 00:14:85:0D:4D:33
inet addr:172.25.1.148 Bcast:172.25.7.255 Mask:255.255.248.0
inet6 addr: fe80::214:85ff:fe0d:4d33/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:91887 errors:0 dropped:0 overruns:0 frame:0
TX packets:23174 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8100258 (7.7 MiB) TX bytes:1459713 (1.3 MiB)
Interrupt:18 Base address:0x2000

But after the reboot, or after disabling and enabling the network my network settings change to :

eth0 Link encap:Ethernet HWaddr 00:14:85:0D:4D:33
inet addr:192.168.1.137 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::214:85ff:fe0d:4d33/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:126537 errors:0 dropped:0 overruns:0 frame:0
TX packets:32475 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:30347246 (28.9 MiB) TX bytes:2257477 (2.1 MiB)
Interrupt:18 Base address:0x2000

and I don't know why becasue I've specified a static configuration, and I've disabled DHCP services. Does anyone know waht I have to do?...Also,even after I've maked the configuration from the terminal ( ifconfig eth0 172.25.1.148 netmask 255.255.248.0 up) are a lot of websites wich I cannot access (for ex: login.yahoo.com -PS firewall is disabled).
I've set the DNS server (in resolv.conf to 172.25.0.2 but after the boot process is modified to another ip), and the default gateway (172.25.0.1), here is the route-n command:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.25.0.0 0.0.0.0 255.255.248.0 U 0 0 0 eth0
172.25.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 172.25.0.1 0.0.0.0 UG 0 0 0 eth0

Can anyone "instruct" me what i have to do? Thanks!

[Iron_Mike]

Check system ->administration ->network, highlight your device and click edit. Uncheck the box that says "controlled by NetworkManager" and restart and see if that fixes it.

OR

If that option is not available, goto system ->administration ->services and uncheck the 2 NetworkManager services, save it and reboot.

[the_virus]

Ok....It seems that now is working and I have access to the internet but I still cannot see some pages...for example I can view www.yahoo.com page, but I cannot access Yahoo mail (www.mail.yahoo.com) and there are also other sites which I need but the browser is not loading them. The firewall is disabled and I'm using Fedora 8.0 .
I will be glade if someone can help me! Thanks!

[the_virus]

And also I have problems with Pidgin, it is just "connecting" and nothing more...

[the_virus]

I've disabled Selinux ...but the problem persist...if someone has any idea how to fix it, I'll be grateful to him! Thanks!

[Iron_Mike]

See my PM to you.