Step Three: Testing internal MASQ client to MASQ server
connectivity
Next, from the same internal MASQed computer, try pinging the the IP address of
the Linux MASQ server's INTERNAL interface (i.e. ping
192.168.0.1 ). This will verify that TCP/IP is correctly working
on both the local and Linux MASQ machine. Almost ALL modern operating systems
have built-in support for the "ping" command. If this ping doesn't work, make
sure that TCP/IP is correctly configured on the MASQed Server as described
by the various Network HOWTOs (URLs can be found in the requirements section
for your
2.4.x kernel in Section 2.6,
2.2.x kernel in Section 2.7, or
2.0.x kernel in Section 2.8).
The output should
look something like the following (hit Control-C to abort the ping):
------------------------------------
masq-client# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1): 56 data bytes
64 bytes from 192.168.0.1: icmp_seq=0 ttl=255 time=0.8 ms
64 bytes from 192.168.0.1: icmp_seq=1 ttl=255 time=0.4 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=255 time=0.4 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=255 time=0.5 ms
^C
--- 192.168.0.1 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.4/0.5/0.8 ms
------------------------------------ |
If the ping failed, check the network connection between the MASQ server and
the PC. If it's a DIRECT Ethernet connection (no hub or switch), you MUST
have a "Ethernet cross-over cable". These cables are common and can be
found at any computer store. Without this cable, the NICs (network cards)
will not give you a "LINK" light. If you are using a hub or switch, make
sure the ports connected to the MASQ server and MASQed client machine have a
LINK light. If they do and the pings STILL don't work or there is a lot of
packet loss, try different ports on the hub/switch (it not all that uncommon
to have hub/switch ports die). Finally, if things still don't work perfectly,
try replacing each of the NICs in the machines. You would be surprised how
many people I've helped have found that their NIC cards were going bad and
caused them all kinds of grief.