by I'm having a problem and, after spending hours searching the web and
trying various ideas I've had, I've still had no success. I have a
linux box connected to the university ethernet here, which also has a
radio modem attached to one of its serial ports. I've been trying to
set this modem up such that I can haul the laptop around without being
cabled down to anything. Simple enough, right, since they both have
real IP numbers assigned to them? Ethernet interface on one side, PPP
with the proxyarp option on the other, and everything supposedly works.
However, I can get the PPP link established and working (I can telnet
from the laptop to the linux box), and the linux box can see the rest of
the net through the ethernet interface, but packets are not making it
between the interfaces.
I've set up systems like this before, and have never had any problems
until this time. But no matter what I try or how many times I check my
work, I can't get proxyarp to work in this case.
The linux server is named larry.eng.iastate.edu (129.186.4.149), and is
a P-120 with a fairly straightforward RedHat 5.0 distribution with a
2.0.35 kernel (which, yes, has forwarding/gatewaying turned on). The
laptop is a W95 box named excytor (129.186.4.128).
The system is straightfoward, laid out like this:
<ENET BACKBONE> --------- (eth0) [larry.eng.iastate.edu]
(ppp0)---------(ppp)[excytor.eng.iastate.edu]
If anyone has any idea why this system might not work, could you please
email me? It would be greatly appreciated if anyone could help me out.
Nathan D. Holmes
For assistance, here are a few critical things about the system:
pppd startup command:
/usr/sbin/pppd /dev/cua0 19200 crtscts proxyarp persist mru 576 mtu 576
129.186.4.149:129.186.4.128
ifconfig:
lo Link encap:Local Loopback
inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0
UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1
RX packets:808 errors:0 dropped:0 overruns:0
TX packets:808 errors:0 dropped:0 overruns:0
eth0 Link encap:Ethernet HWaddr 00:AA:00:62:59:B1
inet addr:129.186.4.149 Bcast:129.186.4.255
Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18764 errors:0 dropped:0 overruns:0
TX packets:1871 errors:0 dropped:0 overruns:0
Interrupt:10 Base address:0x300
ppp0 Link encap:Point-to-Point Protocol
inet addr:129.186.4.149 P-t-P:129.186.4.128
Mask:255.255.255.0
UP POINTOPOINT RUNNING MTU:576 Metric:1
RX packets:10 errors:0 dropped:0 overruns:0
TX packets:11 errors:0 dropped:0 overruns:0
route:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
excytor.eng.ia * 255.255.255.255 UH 0 0 1
ppp0
129.186.4.0 * 255.255.255.0 U 0 0 11
eth0
127.0.0.0 * 255.0.0.0 U 0 0 4
lo
default router4.iastate 0.0.0.0 UG 0 0 10
eth0
arp:
Address HWtype HWaddress Flags
Mask Iface
mulder.eng.iastate.edu ether 00:80:48:A9:FC:A4
C eth0
129.186.4.254 ether 00:10:11:AD:C8:80
C eth0
phoenix.eng.iastate.edu ether 00:00:C0:DE:30:D8
C eth0
excytor.eng.iastate.edu ether 00:AA:00:62:59:B1
CMP eth0