How to tracerouting a 192.168.x.x exit the local network

networking

In a LAN if I traceroute the IP address of any other machine, it gets it in one hop <1 ms.

However, there is one machine, which if I traceroute, it exits the private network, goes out through external IP adresses, until it stops because of a timeout.

A mail server runs on that machine and it's working properly, if this information is of any help.

What can be the cause of such a strange behavior?

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Aktive Routen:
     Netzwerkziel    Netzwerkmaske          Gateway   Schnittstelle  Anzahl
          0.0.0.0          0.0.0.0     192.168.1.10   192.168.1.148       20
        127.0.0.0        255.0.0.0        127.0.0.1       127.0.0.1       1
      192.168.1.0    255.255.255.0    192.168.1.148   192.168.1.148       20
    192.168.1.148  255.255.255.255        127.0.0.1       127.0.0.1       20
    192.168.1.255  255.255.255.255    192.168.1.148   192.168.1.148       20
        224.0.0.0        240.0.0.0    192.168.1.148   192.168.1.148       20
  255.255.255.255  255.255.255.255    192.168.1.148   192.168.1.148       1
Standardgateway:      192.168.1.10

Best Answer

Simple. Due to the routing it falls back to the default route, unless 192.168.x.x is 192.168.1.x - there is a specific route only for the 192.168.1

Anything else (i.e. 192.168.5.6) will go via default route and that may leave the network. Any non-stupid admin will filter those IP addresses on the gateway router, for security reasons.

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