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Internet Related/Filtering/Firewall Thread, No internet on specific IP range!!! in Technical; Hi All, Just a quick question (hopefully!) On my network we have one DHCP server; the ip address starts at ...
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    No internet on specific IP range!!!

    Hi All,

    Just a quick question (hopefully!)

    On my network we have one DHCP server; the ip address starts at 192.168.0.1 and ends at 192.168.1.254 with a subnet mask of 255.255.254.0.

    Any machine that connects with an ip address in the 192.168.0. range can connect to the internet with no problems, however any machine that is assigned an ip in the 192.168.1. range cannot access the internet at all.

    I cannot ping 8.8.8.8 or bbc.co.uk or even perform a tracert. I can however ping the router at 192.168.1.254.

    I have spoken to the internet providers and they have assured me that the router is set to the same 255.255.254.0 range.

    Any advice would be much appreciated as we are constantly running our of room on the DHCP Scope.

    cheers guys!!

  2. #2
    Mr.Ben's Avatar
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    What subnet mask is DHCP handing out for th 192.168.1 range?

  3. Thanks to Mr.Ben from:

    jhammond (31st January 2014)

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    the subnet mask for this is also 255.255.254.0

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    nephilim's Avatar
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    why isn't it dishing out on the 255.255.255.0 range?

  6. Thanks to nephilim from:

    jhammond (31st January 2014)

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    ive just taken over the network at the school and this was the state I found it in; not the greatest. The subnet mask has already been set to 255.255.254.0. This was all created by the dreaded RM network technicians I believe

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    nephilim's Avatar
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    Ahh I see. Well I would assign a private IP range and start moving people.

    10.9.1.x - 10.9.3.x For Admin machines
    10.9.4.x - 10.9.7.x For Teaching machines
    10.9.8.x - 10.9.10.x For student machines
    10.9.11.x - 10.9.30.x For anything else

    All should work on the 255.255.254.0

  9. Thanks to nephilim from:

    jhammond (31st January 2014)

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    That is something that I do want to do, but was going to be a holiday job, as there are currently no VLAN's setup.

    The main switch is a Cisco SG200-50

  11. Thanks to jhammond from:

    nephilim (31st January 2014)

  12. #8

    nephilim's Avatar
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    You can set the VLANs up now, and start shifting people in batches. For example, do an IT class room, put it out of use for a day for maintenance. Rinse and repeat around the school

  13. Thanks to nephilim from:

    jhammond (31st January 2014)

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    true; but I am tight for time at the moment as I am the only technician in the school, that's why I was wondering if there was an obvious reason why my current range would not work!

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    So, What is the default gateway being recieved by clients?

    Can you paste and ipconfig from a host which does work and a host which doesn't prefereably alongside the results of route print

    P.S. I am using subnet mask of 255.255.254.0 on a couple of VLAN's so know it works fine

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    this is the ipconfig when the internet works and the route print

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Intel(R) 82579V Gigabit Network Connectio
    n
    Physical Address. . . . . . . . . : 74-27-EA-53-45-38
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::20f9:4973:4f74:cbcd%10(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.0.200(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.254.0
    Default Gateway . . . . . . . . . : 192.168.1.254
    DHCPv6 IAID . . . . . . . . . . . : 242493418
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-25-0C-87-74-27-EA-53-45-38

    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Interface List
    10...74 27 ea 53 45 38 ......Intel(R) 82579V Gigabit Network Connection
    1...........................Software Loopback Interface 1
    11...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
    15...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
    ================================================== =========================
    IPv4 Route Table
    ================================================== =========================
    Active Routes:
    Network Destination Netmask Gateway Interface Metric
    0.0.0.0 0.0.0.0 192.168.1.254 192.168.0.200 266
    127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
    127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
    127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
    192.168.0.0 255.255.254.0 On-link 192.168.0.200 266
    192.168.0.200 255.255.255.255 On-link 192.168.0.200 266
    192.168.1.255 255.255.255.255 On-link 192.168.0.200 266
    224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
    224.0.0.0 240.0.0.0 On-link 192.168.0.200 266
    255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
    255.255.255.255 255.255.255.255 On-link 192.168.0.200 266
    ================================================== =========================
    Persistent Routes:
    Network Address Netmask Gateway Address Metric
    0.0.0.0 0.0.0.0 192.168.1.254 Default
    ================================================== =========================
    IPv6 Route Table
    ================================================== =========================
    Active Routes:
    If Metric Network Destination Gateway
    1 306 ::1/128 On-link
    10 266 fe80::/64 On-link
    10 266 fe80::20f9:4973:4f74:cbcd/128
    On-link
    1 306 ff00::/8 On-link
    10 266 ff00::/8 On-link
    ================================================== =========================
    Persistent Routes:
    None




    and here is the one wen there is no internet

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Intel(R) 82579V Gigabit Network Connectio
    n
    Physical Address. . . . . . . . . : 74-27-EA-53-45-38
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::20f9:4973:4f74:cbcd%10(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.1.200(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.254.0
    Default Gateway . . . . . . . . . : 192.168.1.254
    DHCPv6 IAID . . . . . . . . . . . : 242493418
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-25-0C-87-74-27-EA-53-45-38
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Microsoft Windows [Version 6.1.7601]
    Copyright (c) 2009 Microsoft Corporation. All rights reserved.
    C:\Users\systemadmin.STCATHERINES>route print
    ================================================== =========================
    Interface List
    10...74 27 ea 53 45 38 ......Intel(R) 82579V Gigabit Network Connection
    1...........................Software Loopback Interface 1
    11...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
    15...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
    ================================================== =========================
    IPv4 Route Table
    ================================================== =========================
    Active Routes:
    Network Destination Netmask Gateway Interface Metric
    0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.200 266
    127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
    127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
    127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
    192.168.0.0 255.255.254.0 On-link 192.168.1.200 266
    192.168.1.200 255.255.255.255 On-link 192.168.1.200 266
    192.168.1.255 255.255.255.255 On-link 192.168.1.200 266
    224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
    224.0.0.0 240.0.0.0 On-link 192.168.1.200 266
    255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
    255.255.255.255 255.255.255.255 On-link 192.168.1.200 266
    ================================================== =========================
    Persistent Routes:
    Network Address Netmask Gateway Address Metric
    0.0.0.0 0.0.0.0 192.168.1.254 Default
    ================================================== =========================
    IPv6 Route Table
    ================================================== =========================
    Active Routes:
    If Metric Network Destination Gateway
    1 306 ::1/128 On-link
    10 266 fe80::/64 On-link
    10 266 fe80::20f9:4973:4f74:cbcd/128
    On-link
    1 306 ff00::/8 On-link
    10 266 ff00::/8 On-link
    ================================================== =========================
    Persistent Routes:
    None

    C:\Users\systemadmin.STCATHERINES>

  17. #12

    nephilim's Avatar
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    is the gateway and DNS the same for the machine next to it?

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    FN-GM's Avatar
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    Unless I am mistaken 255.255.254.0 isn't an option for a Class C network?
    Last edited by FN-GM; 31st January 2014 at 04:08 PM.

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    Quote Originally Posted by FN-GM View Post
    Unless I am mistaken 255.255.254.0 isn't an option for a Class C network?
    Looking here : Codebox Software - IP Network Address Calculator

    Shows its a /23 cidr

    Subnet Netmask 255.255.254.0
    Network 192.168.0.0/23
    Min Host 192.168.0.1
    Max Host 192.168.1.254
    Broadcast Address 192.168.1.255
    Max Hosts on Subnet 510
    Last edited by mac_shinobi; 31st January 2014 at 04:20 PM.

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    Quote Originally Posted by FN-GM View Post
    Unless I am mistaken 255.255.254.0 isn't an option for a Class C network?
    /23 is just a supernet of 2 class C scopes joined together it should be no problem at all.

  21. Thanks to SkreeM1980 from:

    mac_shinobi (31st January 2014)

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