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Internet Related/Filtering/Firewall Thread, No internet on specific IP range!!! in Technical; Can a computer with an ip range on 192.168.0.x ping any other computer (not the gateway) on 192.168.1.x ?? I'm ...
  1. #16

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    Can a computer with an ip range on 192.168.0.x ping any other computer (not the gateway) on 192.168.1.x ??

    I'm wondering if each subnet has been attached to a different NIC on the router gateway and has some funny access lists on it.

    Dave

  2. #17

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    The IP config and Routing table all look brilliant.

    Do you get ping response from the gateway?

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    the one thing I'm also not sure of is why do you have persistent routes set on the PC? There is no need for persistent routes as the default gateway is set via DHCP

    I'd suggest removing them from a test machine. the commands to do in this order

    route delete 0.0.0.0
    ipconfig renew
    arp flush


    Also do an "arp -a" command on a machine on the 192.168.0.x range and the 192.168.1.x range. Then see if the MAC address is the same for the 192.168.1.254 (gateway router address). If its not then perhaps you have 2 different routers on the same IP address on the network?!

    Really clutching at straws here but I've seen odder things.

    Dave

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    mac_shinobi's Avatar
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    Quote Originally Posted by SchoolsBroadband View Post
    the one thing I'm also not sure of is why do you have persistent routes set on the PC? There is no need for persistent routes as the default gateway is set via DHCP

    I'd suggest removing them from a test machine. the commands to do in this order

    route delete 0.0.0.0
    ipconfig renew
    arp flush


    Also do an "arp -a" command on a machine on the 192.168.0.x range and the 192.168.1.x range. Then see if the MAC address is the same for the 192.168.1.254 (gateway router address). If its not then perhaps you have 2 different routers on the same IP address on the network?!

    Really clutching at straws here but I've seen odder things.

    Dave
    @SchoolsBroadband

    Not sure if this has any bearing on any of this but if you look at both ipconfig's , it is showing as DHCP Disabled / off

    DHCP Enabled. . . . . . . . . . . : No

  5. #20

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    Quote Originally Posted by mac_shinobi View Post
    @SchoolsBroadband

    Not sure if this has any bearing on any of this but if you look at both ipconfig's , it is showing as DHCP Disabled / off

    DHCP Enabled. . . . . . . . . . . : No
    doh good point

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    mac_shinobi (31st January 2014)

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    Your subnet and all that look good to me. I suspect your gateway/router or proxy is running on a 255.255.255.0 subnet so wont respond. Chances is are that's how it was set up originally and someone expanded the subnet at some point without finishing the job!
    No need for all the VLAN stuff, it'll be a simple fix :-)

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    I can ping te default gateway when on the 192.168.1. range

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    Hi Synkrox,I have spoken to RM (who host the router and have access to it) and they state that this is running on 255.255.254.0. I have used a cross over cable and plugged a laptop directly into the router and used the DNS server address they have given me and my ip address of 192.168.1.150 and this works. So i do not believe it is a config error on the router!

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    Perhaps your proxy doesn't have an ACL/Policy for that subnet to pass traffic then?

    (edit: just saw your previous post) - I'm stumped then. If you have a machine on that IP range keep moving it one device further away from the router until it stops working. With a flat network no reason for traffic not to be passed.
    Last edited by Synkrox; 3rd February 2014 at 01:44 PM.

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    Quote Originally Posted by jhammond View Post
    Hi Synkrox,I have spoken to RM (who host the router and have access to it) and they state that this is running on 255.255.254.0. I have used a cross over cable and plugged a laptop directly into the router and used the DNS server address they have given me and my ip address of 192.168.1.150 and this works. So i do not believe it is a config error on the router!
    Ok,

    So what exists between your client computers and the router?

    Did you say that you can't get a traceroute to a public internet address? (8.8.8.8 for example)

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    In this case all that is between the pc is the main switch.

    In regards to the arp-a question raised by David Tindall.
    I have set a static ip of 192.168.0.157 and performed arp-a and the mac address for 192.168.1.254 is 04-fe-7f-5a-9b-cb
    the static ip has then been set to 192.168.1.150 and i have performed arp-a and got the mac address for 192.168.1.254 as 00-1a-70-8d-ae-74

    this is showing two different mac addresses. Weird!

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    Whats the core switch and does RM do your filtering off-site or do you have a proxy on the network?
    Posting the config of the core switch might help if its managed? if you know it should be a flat network backup the config just in case and hard reset it perhaps?

  14. #28

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    Quote Originally Posted by jhammond View Post
    this is showing two different mac addresses. Weird!
    Agreed Very Weird.

    Have you got anything odd connected that may be also grabbing that IP? Last time I saw similar we had a wireless AP and a router 'sharing' and IP address.

    What switches do you have, do you have management access to them (telnet ssh etc)

    You could do a MAC trace through the switches and see where the device 00-1a-70-8d-ae-74 is connected, and therefore what it is.

    According to Wireshark OUI Lookup Tool it is a Cisco/Linksys Device

  15. #29
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    Have you checked that DNS has a reverse lookup zone for that IP address range?

  16. #30

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    yes the DNS has a reverse look up zone for 192.168.1.x subnet

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