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XG135 Strange LAN problem

Edtrick Lam

I just upgrade to XG135 FW. After that, our client cannot get IP from internal DHCP server.. 

Herewith our network details:-

XG135 WAN port connect to ISP (202.x.x.x)

XG135 LAN port  (192.x.x.1/24) connect to internal layer 3 routing switch (192.x.x.25/24)

internal DHCP server (192.x.x.7/24) connect to internal layer 3 routing switch

DHCP server leased IP range (192.x.x.101-200/24), leased default Gateway (192.x.x.25/24)

** That Layer3 routing switch have a static route to other branch office via MPLS router (192.x.x.50/24 same subnet), so we set it for default gateway.

Is it because default gateway is Layer3 routing switch, that why XG135 block our DHCP server.

Please advise any comments.

**(After I plugged XG135, I got a lot of problem (smtp relay deny, dhcp failed, other LAN services between layer3 routing switch. Finally I need to fall back to old netgear router, then everything in normal)

 

 

 



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  • 0

    Lam,

    for the DHCP, you need to configure DHCP relay if the dhcp traffic traverse XG. You can do it under Network > DHCP > Relay.

    For the other issue, please create a proper thread for each one. One thread, one question.

    Regards

  • 0 in reply to lferrara

    Luk, 

    thanks your reply.

    I tried before but client cannot get IP.

    Refer to sophos article , The DHCP relay used to forward DHCP requests and responses across network segments.

    Our DHCP Server, Layer 3 Switch (Default gateway), workstation is in same subnet (192.168.0.x/24). So DHCP relay still work in same subnet???

    Do I need to add firewall policy (Allow LAN - LAN )??

    For our old router, I didn't have this setting but client can get IP from DHCP server. 

    I just wonder whether our default gateway is Layer3 routing switch (not XG-135), that why block our DHCP server to lease IP?? 

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  • 0 in reply to lferrara

    Luk, 

    thanks your reply.

    I tried before but client cannot get IP.

    Refer to sophos article , The DHCP relay used to forward DHCP requests and responses across network segments.

    Our DHCP Server, Layer 3 Switch (Default gateway), workstation is in same subnet (192.168.0.x/24). So DHCP relay still work in same subnet???

    Do I need to add firewall policy (Allow LAN - LAN )??

    For our old router, I didn't have this setting but client can get IP from DHCP server. 

    I just wonder whether our default gateway is Layer3 routing switch (not XG-135), that why block our DHCP server to lease IP?? 

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