Linux IP Masquerade HOWTO
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# 5.4. Testing internal MASQ server connectivity

- Step Four: Testing internal MASQ server connectivity

  On the MASQ server, ping the internal IP address of the MASQ server's network interface card (i.e. ping 192.168.0.1). 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-server# 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
      ---------------------------------------

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