[lug] Forwarding or routing question
Chip Atkinson
chip at pupman.com
Sun Oct 10 09:58:58 MDT 1999
Greetings all,
I'm having a bit of trouble getting a couple machines to talk to each
other. Here's the situation:
M1 M2 M3 M4
eth0 eth0
192.168.132.5 192.168.132.10
ppp0 ppp0
10.1.0.21 10.1.0.20
eth0 eth0
10.2.0.10 10.2.0.11
Right now I'm trying to get M1 to talk to M3. I check
/proc/sys/net/ipv4/ip_forward and it has a 1 in it, indicating that it will forward
IP traffic. I can traceroute from M1 to 10.1.0.20 (M3's ppp address) and it
stalls at M2's ethernet address. I'm kind of stumped because it looks like routing
is OK, forwarding is permitted, and yet no traffic is going through. Oh, I am able
to ping the ppp0 interface of M2 from M1.
Thanks in advance for any help.
Chip
Here are the interfaces and routes for the machines:
-------------------------
M1: RedHat 6.0
eth0 Link encap:Ethernet HWaddr 02:60:8C:44:A6:BD
inet addr:192.168.132.5 Bcast:192.168.132.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:187556 errors:0 dropped:0 overruns:0 frame:0
TX packets:4740 errors:0 dropped:0 overruns:0 carrier:0
collisions:3 txqueuelen:100
Interrupt:5 Base address:0x300 Memory:cc000-ce000
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.132.5 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
192.168.132.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.1.0.0 192.168.132.10 255.255.0.0 UG 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.132.10 0.0.0.0 UG 0 0 0 eth0
-------------------------
M2: RedHat 5.0
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:1676 errors:0 dropped:0 overruns:0
TX packets:1676 errors:0 dropped:0 overruns:0
eth0 Link encap:Ethernet HWaddr 02:60:8C:9B:4A:0E
inet addr:192.168.132.10 Bcast:192.168.132.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:54733 errors:0 dropped:0 overruns:0
TX packets:14505 errors:0 dropped:0 overruns:0
Interrupt:5 Base address:0x300 Memory:cc000-ce000
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.1.0.21 P-t-P:10.1.0.20 Mask:255.255.0.0
UP POINTOPOINT RUNNING MTU:1500 Metric:1
RX packets:49438 errors:2 dropped:2 overruns:0
TX packets:49458 errors:0 dropped:0 overruns:0
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.1.0.21 0.0.0.0 255.255.255.255 UH 1500 0 0 ppp0
192.168.132.0 0.0.0.0 255.255.255.0 U 1500 0 0 eth0
0.0.0.0 10.1.0.20 255.255.0.0 UG 1500 0 0 ppp0
10.1.0.0 0.0.0.0 255.255.0.0 U 1500 0 0 ppp0
127.0.0.0 0.0.0.0 255.0.0.0 U 3584 0 0 lo
0.0.0.0 0.0.0.0 0.0.0.0 U 1500 0 0 ppp0
-------------------------
M3: RedHat 6.0
eth0 Link encap:Ethernet HWaddr 02:60:8C:9C:C9:16
inet addr:10.2.0.20 Bcast:10.2.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:640 errors:0 dropped:0 overruns:0 frame:0
TX packets:1899 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:5 Base address:0x300 Memory:cc000-ce000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:58 errors:0 dropped:0 overruns:0 frame:0
TX packets:58 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.1.0.20 P-t-P:10.1.0.21 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:49637 errors:0 dropped:0 overruns:0 frame:0
TX packets:49614 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.1.0.21 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
10.2.0.20 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
10.2.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Chip Atkinson
http://www.pupman.com
--- If I can't fix it, I can fix it so it can't be fixed --
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
More information about the LUG
mailing list