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DHCP question

mrshahinmrshahin Newbie ✭
in Entry Level Firewalls

Hi guy's,

I am short on dhcp ip and want to extend the current dhcp scope, the current scope is

172.5.1.20-172.5.3.254

255.255.252.0

gateway: 172.5.1.1

how can I double this range? I tried the /21 but get the error that the gw is not in the same range!!

Thanks

Category: Entry Level Firewalls
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Best Answer

  • CORRECT ANSWER
    BWCBWC Cybersecurity Overlord ✭✭✭
    Answer ✓

    @mrshahin I would presume when the lease expires should do the trick, but cannot say for sure for any kind of endpoint there is.

    --Michael@BWC

Answers

  • BWCBWC Cybersecurity Overlord ✭✭✭

    @mrshahin I guess you did not changed the subnet mask of your network interface from 255.255.252.0 to 255.255.248.0? This causes this message. The DHCP scope will be automatically adjusted after giving the network interface the correct subnet mask.

    Tested on 6.5.4.10 a minute ago.

    --Michael@BWC

  • mrshahinmrshahin Newbie ✭

    @BWC Thank you for your reply,

    I think I already done that,

    So you mean I should change the scope to 172.5.1.20-172.20.4.254 and use the subnet 255.255.248.0 right?

    Thanks

  • BWCBWC Cybersecurity Overlord ✭✭✭

    The subnet mask of your DHCP scope should be already in sync with the related interface settings and the scope goes from 172.5.1.20 - 172.5.4.254 (or up to 172.5.7.254) ... 172.20.4.254 would be out of the subnet :)

    --Michael@BWC

  • mrshahinmrshahin Newbie ✭

    the IP of the X0 is 172.5.1.1 en the subnet is 255.255.252.0

    is this menas the we sohlud first change the subnet of the X0 to 255.255.248.0 and after that change the scope of the dhcp to 172.5.1.20 - 172.5.4.254 (or up to 172.5.7.254) is this correct??

  • BWCBWC Cybersecurity Overlord ✭✭✭

    @mrshahin yes, this is what I tried to explain, change subnet of X0 and then configure the DHCP scope.

    But make sure that your clients will get a new DHCP lease as well, because they need to honor the subnet mask too.

    --Michael@BWC

  • mrshahinmrshahin Newbie ✭

    this is a wifi subnet/vlan shouldn't clients get the new subnet when their dhcp lease is expired? or they must disconnect and reconnect to wifi again?

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