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DHCP Server Not handing out Leases

Shane Serrao over 2 years ago

Hi all,

I am new with Sophos, literally day 3 for this to run on my network.

DHCP Server is behaving very strange.

Sometimes it would work flawlessly and other times it would just stop handing out leases.

I have to turn off the status of the DHCP Range and then when I turn this back on it would hand out leases again.

If I turn the DHCP Server off and back on under System Services --> Services it has got no effect on the leases.

If i manually set static addresses ether on the device or under the dhcp server everything seems fine.

DHCP Server Config

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Shane Serrao over 2 years ago in reply to Thomas_XG +1 suggested

Hi Thomas. Should I perhaps extend the DHCP range as follow 192.168.1.10 - 192.168.1.253?

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0 rfcat_vk over 2 years ago

Hi,XG version?
ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Shane Serrao over 2 years ago in reply to rfcat_vk

Hi rfcat_vk

SFVH (SFOS 19.0.1 MR-1-Build365)
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0 rfcat_vk over 2 years ago in reply to Shane Serrao

Realtek are not favoured especially in high load connections. Check the mtu. Also have you disabled power saving on the board?
ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Shane Serrao over 2 years ago in reply to rfcat_vk

Yes, I have disabled power-saving.

Also aware that Realtek isn't favorable for my use case.

Maybe I should just replace the card and get it over with.

Current MTU and MSS on the Realtek.

MSS: 1460

MTU: 1500
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0 rfcat_vk over 2 years ago in reply to Shane Serrao

that looks good. So maybe the card is going into power saving mode?

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Shane Serrao over 2 years ago in reply to rfcat_vk

rfcat_vk, how would I determine that?
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0 Thomas_XG over 2 years ago in reply to Shane Serrao

I can't test it now but your dynamic IP lease range is outside your static leases - try to set the End IP to 192.168.1.25 and test it again.

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Sophos SG 210 with Sophos XG Home - 20.0 MR 1

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0 Shane Serrao over 2 years ago in reply to Thomas_XG

Hi Thomas.

Should I perhaps extend the DHCP range as follow 192.168.1.10 - 192.168.1.253?
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0 Thomas_XG over 2 years ago in reply to Shane Serrao

You can expand it to 192.168.1.240 for example to reserve the last IPs for static IP mapping directly on a device (without DHCP reservation)

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Sophos SG 210 with Sophos XG Home - 20.0 MR 1

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0 Shane Serrao over 2 years ago in reply to Thomas_XG

I would rather extend the DHCP range and deal with IP conflicts at this very moment before some of the crucial services goes down.

Let me test this and see if it would make a difference.
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0 Thomas_XG over 2 years ago in reply to Shane Serrao

That's the reason why I said to extend it to this value (as an example) before the whole subnet is used in the DHCP lease range - only you know your network best ;)

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Sophos SG 210 with Sophos XG Home - 20.0 MR 1

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0 rfcat_vk over 2 years ago in reply to Thomas_XG

Hi,

on the XG the static range has to be outside the DHCP dynamic range otherwise you end up with errors.

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 rfcat_vk over 2 years ago in reply to Thomas_XG

Hi,

on the XG the static range has to be outside the DHCP dynamic range otherwise you end up with errors.

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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