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Re: LAN/NAS problem.

The address you are using is the "network" address for that /27 range. This would not be considered as a valid address for any *interface* on that network. Typically I would expect to see the first valid address in the subnet as the gateway address in this case it would be 203.28.51.129 - and you have 30 valid addresses to use. 

Check out RFC1878 when you have a chance.

At 12:10 PM 6/8/2000 +1000, Marc-Adrian Napoli wrote:

hi all,
we have an ascend server that serves a dial up customer sitting on 203.28.51.128. 

routing table on the ascend server:

203.28.51.128/27   203.28.51.128   wan12    rGT    120   2    6575    5169
203.28.51.128/32   203.28.51.128   wan12    rT      60   1    4150    5169

they are given the 203.28.51.128/27 subnet from radius.

on the customers end is a linux box acting as a router for their /27 subnet.

ifconfig on the debian box shows:

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:7607 errors:0 dropped:0 overruns:0
          TX packets:7607 errors:0 dropped:0 overruns:0

eth0      Link encap:Ethernet  HWaddr 00:00:E8:47:F3:9C
          inet addr:203.28.51.128  Bcast:203.28.51.159  Mask:255.255.255.224
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:85592 errors:0 dropped:23 overruns:0
          TX packets:6940 errors:0 dropped:0 overruns:0
          Interrupt:9 Base address:0x240

ppp0      Link encap:Point-to-Point Protocol
          inet addr:203.28.51.128  P-t-P:203.63.219.10  Mask:255.255.255.224
          UP POINTOPOINT RUNNING  MTU:1524  Metric:1
          RX packets:10757 errors:0 dropped:0 overruns:0
          TX packets:10410 errors:0 dropped:0 overruns:0

And netstat -rn on the box shows:

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
203.63.219.10   0.0.0.0         255.255.255.255 UH     1524 0          0 ppp0
203.28.51.128   0.0.0.0         255.255.255.224 U      1500 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U      3584 0          0 lo
0.0.0.0         203.63.219.10   0.0.0.0         UG     1524 0          0 ppp0
The .128 gateway works fine. All the internal machines work fine *however* they cannot ping the 203.28.51.128 gateway!
I've done a ping to one of the machines from the gateway (and a tcpdump) and it seems that the ping packet goes out but never comes back.
Should i be looking at the routing tables for the windows boxes? Or does the problem lie on the linux box? 

Thanks for the help!

marc.


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Kevin Smith
TNT/APX Engineering     email: kas@lucent.com
Lucent Technologies     pager: 1619322@skytel.com
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