I've got RH6 working just fine, except for one problem -
"pump".

I've installed the latest version from updates:

[root@cs2867-105 /root]# rpm -q pump
pump-0.6.7-1

and it assigns an IP address just fine via DHCP at bootup
(I'm an Austin RoadRunner cablemodem subscriber):

[root@cs2867-105 /root]# ifconfig
eth0
eth0      Link encap:Ethernet  HWaddr
00:A0:CC:3E:E0:71
          inet addr:24.28.67.225
Bcast:24.28.67.255                   Mask:255.255.255.0
          UP BROADCAST RUNNING  MTU:1500
Metric:1
          RX packets:55484 errors:0 dropped:0 overruns:0
frame:0
          TX packets:51350 errors:0 dropped:0 overruns:0
carrier:0
          collisions:1128 txqueuelen:100
          Interrupt:11 Base address:0xe800

However, it seems that the dhcp lease is *not* being renewed
- forcing me to stop/restart the network interface every
few hours, in order to either re-grab the same IP address,
or be assigned a new one.

Other strangeness:

[root@cs2867-105 /root]# pump -i eth0 -s
Operation failed.

[root@cs2867-105 /root]# pump -R
Operation failed.

[root@cs2867-105 /root]# pump -s
Operation failed.

System is an Intel Celeron 366, Abit BH6 motherboard,
17.2gig IDE HD, Netgear FA310TX (DEC Tulip chipset 10/100bt)
ethernet card, Riva TNT (AGP) video, PS/2 keyboard and
mouse.  256mb RAM.