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Nasty little network problem



I'm somewhat experienced with networking but have run out of ideas
with this.

Please bare with the onslaught of data:
A quick picture:

I'll just use the last to octets of ip numbers since they all start
192.168*

                     INTERNET
                        |
                     CABLE MODEM   
                        |
                     ROUTER (Hardware [Netgear]) IP 0.20 
                        |
                    M5  rh 7.1 IP 1.6 (in) IP 0.5 (out)
                         |
                      H  U  B (Netgear hub no address not a switch))                       
                |        |         |         |  
               IP 1.7   IP 1.5    IP 1.10   IP 1.11 
               M1       M2        M3        M4
The four boxes in a row on the local side work fine with the
exception of M2   They are M1 obsd M2 linux M3 linux M4 solaris X86

M5 is a sort of router too its IPMASQUERADING for the other 4.
(running RH 7.1 and masquerading with iptables)

The mechanical setup really isn't in doubt.  3 of the 4 work.
All four share the same or similar /etc/resolv.conf /etc/hosts

All local addressing is static.  The router pulls down an address
from cable modem via dhcp (cox hookup)

I've checked and rechecked my cables and the ports on the hub. 
Using several of each.

Now the data:  
netstat -nr shows:
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.0     0.0.0.0         255.255.255.0   U         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         192.168.1.6     0.0.0.0         UG        0 0          0 eth0


ifconfig eth0 shows:

eth0      Link encap:Ethernet  HWaddr 00:04:75:AB:F2:33  
          inet addr:192.168.1.5  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:38 errors:0 dropped:0 overruns:0 frame:0
          TX packets:279 errors:0 dropped:0 overruns:0 carrier:13
          collisions:0 txqueuelen:100 
          RX bytes:2280 (2.2 Kb)  TX bytes:16740 (16.3 Kb)
          Interrupt:10 Base address:0x3000 


cat /etc/sysconfig/network:
  NETWORKING=yes
  HOSTNAME=hgp.local.lan
  GATEWAY=192.168.1.6

cat /etc/sysconfig/network-scripts/ifcfg-eth0
  DEVICE=eth0
  BOOTPROTO=none
  BROADCAST=192.168.0.255
  IPADDR=192.168.1.5
  GATEWAY=192.168.1.6
  NETMASK=255.255.255.0
  NETWORK=192.168.1.0
  ONBOOT=yes

Running service network restart:
Shows me 5 oks

Still with all that in place the questionable box can't see any of
the others on the hub, not to mention the routers or internet.
Whereas the other 3 can.  With very similar reading and settings.
I'm mailing this from M1 thru the linux router, hardware router and
cable modem.






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