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Losing DHCP Gateway

Larnel Hight

This problem started with 17.5.0 GA.  The firewall is handling DHCP for my lan.  Users have started to lose the default gateway(the Firewall) randomly throughout the day.  I have to either reset the switch or the desktop network adapter in order to regain internet connectivity.  This does NOT happen to all users at the same time.

I updated to XG 115 SFOS 17.5.5 MR5 but the problem still exists.  This actually introduced another problem of not being able to access the gui from Sophos Central, but that's not as pressing.  Any thoughts on this would be appreciated.

Thanks

Larnel



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  • 0

    So far I have not had a dhcp or internet problem since changing dhcp to the "old" method.

  • 0 in reply to JacobRodriguez

    Maybe i can tell more about this issue. 

    It seems like, in special race conditions, XG is not able to generate for a Client the correct Gateway / DNS Server and only provides a IP.

    The new mode is designed to get "faster and reliable" DHCP Servers in XG. 

    It seems like, smaller Appliances are struggling with this mode, as far as i can tell. 

    Observed this issue only on smaller Appliances / networks.  

    Maybe you guys can actually post your Appliances, you observed this issue.

    Please (Plus XG Home) 

  • 0 in reply to LuCar Toni

    Hello Lucar

    I am using X210rev3 and XG105.

    XG105 have not failed yet and they provide DHCP services all over.

    XG210s provides DHCP only in subnet without Microsoft Active Directory.

    Yesterday I had the problem in a DMZ zone (& subnet).  Only a single device connected there, but with a 100 base-T ethernet controller.  It is a stamp printer for envelops.  Curiously, this machine is brand new, yet 100 base-t.  I unplugged that stamp printer.  Then plugged a laptop in there.  But it would not catch an IP address.

    That DHCP problem happened to us only on subnet where machines are not homogenous and/or old.  Our main subnet as all PC with the exact same motherboard (and exact same Intel network adapter), and two modern printers.

    Paul Jr

  • 0 in reply to LuCar Toni

    The only place I've seen this to be an issues is at home, installed on a Dell OptiPlex 3010 - 128GB SSD and 8GB RAM..

     

    Can't remember the processor - it was something thrown together from old 3010 spares I had.

     

    Customers use Active Directory for DHCP and DNS, so not had any experience on customers sites.

  • 0 in reply to LuCar Toni

    I have 3 in use:

    XG105rev 2: At customer A, with more users then it should be able to handle, 42 computers and tons of site to site vpns...kinda always had to turn off certain services that aren't critical. Had it running 16.5.8 mr 8 for 2 years, never any issues with DHCP.

    XG 105w rev3: I temporarily placed this on-site at customer A a few weeks ago with the same configuration (i did a backup restore) because I wanted to give the latest firmware a try to see if I can upgrade. New unit in place seemed fine so I decided to leave it there for a few days. Well, next morning at open of business, they called me and had no internet due to the DHCP renewal not passing a default gateway. Keep in mind this hardware is much better then the rev2 was. This tells me it has to do with v17 something out introduced like new DHCP method.

    XG210 rev3: I replaced xg105 last week with this nice 210 v3 but to be sure I wouldn't run into issues i ran the dhcp old command right away.  So that doesn't help much i guess. If i had a weekend soon where i could switch back to DHCP new and watch what happens i will.

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  • 0 in reply to LuCar Toni

    I have 3 in use:

    XG105rev 2: At customer A, with more users then it should be able to handle, 42 computers and tons of site to site vpns...kinda always had to turn off certain services that aren't critical. Had it running 16.5.8 mr 8 for 2 years, never any issues with DHCP.

    XG 105w rev3: I temporarily placed this on-site at customer A a few weeks ago with the same configuration (i did a backup restore) because I wanted to give the latest firmware a try to see if I can upgrade. New unit in place seemed fine so I decided to leave it there for a few days. Well, next morning at open of business, they called me and had no internet due to the DHCP renewal not passing a default gateway. Keep in mind this hardware is much better then the rev2 was. This tells me it has to do with v17 something out introduced like new DHCP method.

    XG210 rev3: I replaced xg105 last week with this nice 210 v3 but to be sure I wouldn't run into issues i ran the dhcp old command right away.  So that doesn't help much i guess. If i had a weekend soon where i could switch back to DHCP new and watch what happens i will.

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