https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133518#M19858 <P>The 5100 needs rules to let DHCP server behind it communicate thru VPN tunnel. You should see the drops in logs or using fw ctl zdebug + drop.</P> Mon, 08 Nov 2021 15:08:19 GMT G_W_Albrecht 2021-11-08T15:08:19Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133506#M19854 <P>Hi</P><P>I've set up DHCP relay according to this SK&nbsp;</P><P><A href="https://supportcenter.checkpoint.com/supportcenter/portal?action=portlets.SearchResultMainAction&amp;eventSubmit_doGoviewsolutiondetails=&amp;solutionid=sk107097" target="_blank">Configuring DHCP relay through Site-to-Site VPN on GAIA embedded Appliances (checkpoint.com)</A></P><P>but it is not working, is something else has to be set up ?</P><P>FW 5100 80.30 , SMB 1550 80.20&nbsp;</P> Mon, 08 Nov 2021 14:25:01 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133506#M19854 marcinw 2021-11-08T14:25:01Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133518#M19858 <P>The 5100 needs rules to let DHCP server behind it communicate thru VPN tunnel. You should see the drops in logs or using fw ctl zdebug + drop.</P> Mon, 08 Nov 2021 15:08:19 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133518#M19858 G_W_Albrecht 2021-11-08T15:08:19Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133520#M19859 <P>subnet where the DHCP server is placed is a part of VPN traffic, ANY / ANY traffic is allowed within VPN subnets&nbsp;&nbsp;</P> Mon, 08 Nov 2021 15:15:42 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133520#M19859 marcinw 2021-11-08T15:15:42Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133535#M19863 <P>ok I've found solution I upgraded firmware to&nbsp;fw1_vx_dep_R80_992002285_20.img, and it is working now</P> Mon, 08 Nov 2021 16:47:03 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/DHCP-relay-is-not-working-FW-5100-and-smb-1550/m-p/133535#M19863 marcinw 2021-11-08T16:47:03Z