what device have assigned specific IP address?

Discussion in 'Windows Networking' started by Petr Laznovsky, Feb 14, 2015.

  1. Discrovered strange thing: Accidentaly ping non existent IP address (missing '8' digit on second
    segment) and something reply. But this device is not listed in ARP table!!! How this is possible? Is
    any chance this is real device or only some 'noise' in network stack. I do not use such subnet on my
    local network.

    C:\>ping 192.16.0.1

    Pøíkaz PING na 192.16.0.1 - 32 bajtù dat:
    Odpovìï od 192.16.0.1: bajty=32 èas=9ms TTL=56
    Odpovìï od 192.16.0.1: bajty=32 èas=9ms TTL=56
    Odpovìï od 192.16.0.1: bajty=32 èas=9ms TTL=56
    Odpovìï od 192.16.0.1: bajty=32 èas=9ms TTL=56

    Statistika ping pro 192.16.0.1:
    Pakety: Odeslané = 4, Pøijaté = 4, Ztracené = 0 (ztráta 0%),
    Pøibli¾ná doba do pøijetí odezvy v milisekundách:
    Minimum = 9ms, Maximum = 9ms, Prùmìr = 9ms

    C:\>arp -a | findstr 192.16
    192.168.2.10 00-26-f3-4c-e6-3c dynamická
    Rozhraní: 192.168.0.2 --- 0x11
    192.168.0.1 00-23-54-fa-b7-77 dynamická
    192.168.168.255 ff-ff-ff-ff-ff-ff statická
     
    Petr Laznovsky, Feb 14, 2015
    #1
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  2. Petr Laznovsky

    Rob Guest

    Learn what "routing" is and how an internet of networks is built.
     
    Rob, Feb 14, 2015
    #2
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  3. Dne 14.2.2015 v 21:20 Rob napsal(a):
    You are right, I post insufficient informations: There is no such route

    c:\>netstat -rn | grep 192.16
    192.168.0.0 255.255.255.252 Propojen' 192.168.0.2 286
    192.168.0.2 255.255.255.255 Propojen' 192.168.0.2 286
    192.168.0.3 255.255.255.255 Propojen' 192.168.0.2 286
    192.168.1.0 255.255.255.0 Propojen' 192.168.0.2 286
    192.168.1.100 255.255.255.255 Propojen' 192.168.0.2 286
    192.168.1.255 255.255.255.255 Propojen' 192.168.0.2 286
    192.168.2.0 255.255.255.0 Propojen' 10.12.34.158 257
    192.168.2.30 255.255.255.255 Propojen' 10.12.34.158 257
    192.168.2.255 255.255.255.255 Propojen' 10.12.34.158 257
    192.168.168.0 255.255.255.0 Propojen' 192.168.0.2 286
    192.168.168.2 255.255.255.255 Propojen' 192.168.0.2 286
    192.168.168.255 255.255.255.255 Propojen' 192.168.0.2 286
    224.0.0.0 240.0.0.0 Propojen' 192.168.0.2 286
    255.255.255.255 255.255.255.255 Propojen' 192.168.0.2 286

    There is not such assigned address in PC

    c:\>ipconfig | findstr 192.16
    Adresa IPv4 . . . . . . . . . . . : 192.168.0.2
    Adresa IPv4 . . . . . . . . . . . : 192.168.1.100
    Adresa IPv4 . . . . . . . . . . . : 192.168.168.2
    Adresa IPv4 . . . . . . . . . . . : 192.168.2.30

    and packets seem not going out of my PC:

    c:\>windump -ni 2 net 192.16
    windump: listening on \Device\NPF_{5143ADA0-3D12-4B11-AB21-89A42DDE8628}
    21:51:33.030465 IP 10.12.48.49 > 192.16.0.1: ICMP echo request, id 512, seq 8960, length 40
    21:51:33.044173 IP 192.16.0.1 > 10.12.48.49: ICMP echo reply, id 512, seq 8960, length 40
    21:51:34.045073 IP 10.12.48.49 > 192.16.0.1: ICMP echo request, id 512, seq 9216, length 40
    21:51:34.056315 IP 192.16.0.1 > 10.12.48.49: ICMP echo reply, id 512, seq 9216, length 40
    21:51:35.056710 IP 10.12.48.49 > 192.16.0.1: ICMP echo request, id 512, seq 9472, length 40
    21:51:35.065686 IP 192.16.0.1 > 10.12.48.49: ICMP echo reply, id 512, seq 9472, length 40
    21:51:36.066310 IP 10.12.48.49 > 192.16.0.1: ICMP echo request, id 512, seq 9728, length 40
    21:51:36.076738 IP 192.16.0.1 > 10.12.48.49: ICMP echo reply, id 512, seq 9728, length 40
    21:51:37.077397 IP 10.12.48.49 > 192.16.0.1: ICMP echo request, id 512, seq 9984, length 40
    21:51:37.086826 IP 192.16.0.1 > 10.12.48.49: ICMP echo reply, id 512, seq 9984, length 40

    OS Windows 7 Home, 64bit
     
    Petr Laznovsky, Feb 14, 2015
    #3
  4. Petr Laznovsky

    Rob Guest

    Please post the entire routing table.
    There most likely is an entry with 0.0.0.0 0.0.0.0

    The address 192.16.0.1 is on internet!
    I can ping it here as well.
    The path is via your default router.
     
    Rob, Feb 14, 2015
    #4
  5. Dne 14.2.2015 v 22:18 Rob napsal(a):
    Mea maxima culpa!!!

    Exchange privat subnet 10/8 with 192/8, but this reserved subnet is only 192.168/16

    192.16.x.x ir really ipv6 routable address. My fault, apology...
     
    Petr Laznovsky, Feb 14, 2015
    #5
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