No route to host

[Roman Neuhauser]

# MLandman at face2interface.com / 2003-11-09 19:00:28 -0500:
> At 05:29 PM 11/9/2003, Luke Kearney wrote:
> 
> >OK I think I see the problem. Your winblows machines are on a different
> >network to the FBSD machine. Change FBSD to 192.168.0.7 and all should
> >be just fine.
> 
> Very cool Luke; this worked and my FBSD box now can ping my Windoz boxes 
> and vice versa.
> 
> >There is no route to host for the other machines because
> >as far as FBSD is concerned the other machines should be on a different
> >wire.
> 
> So that third node on the IP addr represents what, the switch?

    no, it's the subnet. ok, this is not a helpful answer. in one of
    your previous post, you wrote:

    192.168.0.1 (win-xp)
    192.168.0.150 (win-95)
    192.168.7.7 (freebsd-4.8/mini)
    192.168.0.3 (win-98)
    192.168.0.160 (win-95)

    Destination   Gateway            Flags  Refs  Use  Netif Expire
    127.0.0.1     127.0.0.1          UH     0     0    lo0
    192.168.7     link#1             UC     1     0    ep0
    192.168.7.7   00:20:af:4d:24:b7  UHLW   0     1    lo0

    #ifconfig -a
    ep0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
              inet 192.168.7.7 netmask 0xffffff00 broadcast 192.168.7.255
              ether 00:20:af:4d:24:b7
              media: Ethernet 10baseT/UTP
    lp0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500
    faith0: flags=8002<BROADCAST,MULTICAST> mtu 1500
    lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
              inet 127.0.0.1 netmask 0xff000000
    ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
    sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 552

    the netmask in the ifconfig output is important, because the host
    uses its ip address and the netmask to figure out where it should be
    sending packets for a given ip. it does so by "masking" the ip
    address with the netmask: the bits that are turned on in the mask
    cover "local" (in the network sense) part of the address;

    inet 192.168.7.7 netmask 0xffffff00
    or the equivalent
    inet 192.168.7.7 netmask 255.255.255.0

    means 192.168.7 is the part common to all hosts on the network, and
    there are 256 distinct addresses on the network (254 hosts, 0 for
    the address of the network, 255 for the broadcast address).
    
    addresses that are local (on the same wire) can be sent the packets
    directly, foreign addresses (on a different network) require passing
    the traffic through a box connected to the foreign logical network.
    you had no route configured for the 192.168.0/24 network, hence the
    error.

> IOW you're saying since all the other boxes on the LAN are
> 192.168.0.nnn the FBSD box needed to be as well?

    given the netmask you use, yes. or you could change the mask on all
    hosts to, say, 255.255.0.0.

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