Re: Re: Re: F8 Network Woe

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On Dec 12, 2007 2:13 AM, Jonathan Allen <jonathan@xxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Dec 11, 2007 at 03:22:14PM -0600, Aaron Konstam wrote:
> >
> > You are right. I sent you to the wrong command.
> > host 192.168.1.6
> > nslookup 192.168.1.6
>
>    ** server can't find 6.1.168.192.in-addr.arpa: NXDOMAIN
>
> So that does seem to rule out the address beiny anywhere in use on the local
> network, doesn't it?
>
> Jonathan
>
>
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Hi Jonathan!

I do not recall if I had to add these but arp and arping deal below
the IP stack -- all part of Address Resolution Protocol.  Please note
the following session (edited for privacy);
--------------------------------------------------------
[root@localhost tod]# ping 192.168.0.103
PING 192.168.0.103 (192.168.0.103) 56(84) bytes of data.
>From 192.168.0.104 icmp_seq=2 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=3 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=4 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=6 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=7 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=8 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=10 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=11 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=12 Destination Host Unreachable

--- 192.168.0.103 ping statistics ---
13 packets transmitted, 0 received, +9 errors, 100% packet loss, time 12000ms
, pipe 3
[root@localhost tod]# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=1.08 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=0.812 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=0.772 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=0.808 ms
64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=0.812 ms

--- 192.168.0.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4002ms
rtt min/avg/max/mdev = 0.772/0.857/1.082/0.114 ms
[root@localhost tod]# ping 192.168.0.105
PING 192.168.0.105 (192.168.0.105) 56(84) bytes of data.
>From 192.168.0.104 icmp_seq=2 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=3 Destination Host Unreachable
>From 192.168.0.104 icmp_seq=4 Destination Host Unreachable

--- 192.168.0.105 ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2999ms
, pipe 3
[root@localhost tod]# ping 192.168.0.102
PING 192.168.0.102 (192.168.0.102) 56(84) bytes of data.
64 bytes from 192.168.0.102: icmp_seq=1 ttl=128 time=3.70 ms
64 bytes from 192.168.0.102: icmp_seq=2 ttl=128 time=0.651 ms
64 bytes from 192.168.0.102: icmp_seq=3 ttl=128 time=0.670 ms
64 bytes from 192.168.0.102: icmp_seq=4 ttl=128 time=0.658 ms
64 bytes from 192.168.0.102: icmp_seq=5 ttl=128 time=0.668 ms
64 bytes from 192.168.0.102: icmp_seq=6 ttl=128 time=0.666 ms
64 bytes from 192.168.0.102: icmp_seq=7 ttl=128 time=0.670 ms
64 bytes from 192.168.0.102: icmp_seq=8 ttl=128 time=0.655 ms
64 bytes from 192.168.0.102: icmp_seq=9 ttl=128 time=1.84 ms
64 bytes from 192.168.0.102: icmp_seq=10 ttl=128 time=0.715 ms
^C64 bytes from 192.168.0.102: icmp_seq=11 ttl=128 time=0.610 ms
64 bytes from 192.168.0.102: icmp_seq=12 ttl=128 time=0.720 ms
64 bytes from 192.168.0.102: icmp_seq=13 ttl=128 time=0.677 ms
64 bytes from 192.168.0.102: icmp_seq=14 ttl=128 time=0.706 ms
64 bytes from 192.168.0.102: icmp_seq=15 ttl=128 time=0.607 ms

--- 192.168.0.102 ping statistics ---
15 packets transmitted, 15 received, 0% packet loss, time 14005ms
rtt min/avg/max/mdev = 0.607/0.948/3.709/0.795 ms
[root@localhost tod]# /sbin/arp -v
Address                  HWtype  HWaddress           Flags Mask            Iface
192.168.0.101            ether   00:20:ED:CD:5B:E9   C                     eth0
192.168.0.102            ether   00:14:FF:79:23:41   C                     eth0
192.168.0.1              ether   00:1C:AF:AF:8F:38   C                     eth0
192.168.0.103                    (incomplete)                              eth0
192.168.0.105                    (incomplete)                              eth0
Entries: 5      Skipped: 0      Found: 5

Note: 1-101-102 exist.  They did not exist in the arp cash before being pinged.

Now using "unicast" (man arping):

[root@localhost tod]# /sbin/arping -I eth0 192.168.0.102
ARPING 192.168.0.102 from 192.168.0.104 eth0
Unicast reply from 192.168.011.102 [00:14:FF:79:23:41]  3.230ms

Have Fun!

Tod


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