I have just installed RedHat Linux 4.1 on a new system, and can't seem to get networking going. On my previous system, I managed to get it going by trial and error hacking, but would like to do it "right" this time (especially since I can't remember what I did before!).
My initial kernel build had modules enabled; I got the old favorite problem with incompatible versions and undefined symbols in modules, and finally in disgust, disabled the modular kernel stuff and compiled everything right into the bloody kernel.
I used RedHat's control panel for network setup and configured a ppp0 device as per instructions. I made sure I had the loopback device configured, and made sure that networking was enabled in the kernel.
On my previous system, I used Dip to dial up my ISP; I am using the exact same script on this system, which dials and connects uneventfully. However, when it gets to the very last step, switching to PPP mode, it drops the line. I tried going through the whole procedure manually so I could see the dialog, and all looks normal. I suspect that Dip is unable to make a socket connection or whtever the kernel uses, and bails out, but that is only a guess.
BTW, I have OS/2 installed in another partition on this system, and it connects happily to the same ISP through the same modem; therefore, I am quite sure I am dealing with a Linux configuration issue here, not a hardware problem.
Any ideas? What should I check?