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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