topic RE: x440G2 DHCP DNS option in ExtremeSwitching (EXOS/Switch Engine)

x440G2 DHCP DNS option

Thomas_Handber1 — Mon, 20 Feb 2017 22:34:00 GMT

Hi

I'm having a problem with the DHCP on a X440G2.

I have a small site where I normally have used a x250e with out any problem.

But now I have installed a X440G2, and my computers get the gateway as DNS server instead of what I have configured in dhcp-options dns-server primary.

I have tried these 2 firmware
21.1.1.4
22.1.1.5
But have the same problem on them both.

Have anyone else had the same problem?

Thomas

RE: x440G2 DHCP DNS option

Patrick_Voss — Mon, 20 Feb 2017 22:46:00 GMT

Hello Thomas,

Can you provide us with your configuration? Is the x440g2 running on a patched version of these images?

RE: x440G2 DHCP DNS option

Thomas_Handber1 — Mon, 20 Feb 2017 22:58:00 GMT

Hi Patrick

21.1.1.4 is patch 4

My conf
#
# Module vlan configuration.
#
configure vlan default delete ports all
configure vr VR-Default delete ports 1:1-28
configure vr VR-Default add ports 1:1-28
configure vlan default delete ports 1:1-28
create vlan "AR"
configure vlan AR tag 200
create vlan "TX"
configure vlan TX tag 2222
configure vlan AR add ports 1:24 tagged
configure vlan TX add ports 1:1-20 untagged
configure vlan AR ipaddress 172.16.16.12 255.255.255.248
enable ipforwarding vlan AR
configure vlan TX ipaddress 10.21.192.4 255.255.252.0
enable ipforwarding vlan TX

#
# Module rtmgr configuration.
#
configure iproute add default 172.16.16.9

#
# Module netTools configuration.
#
configure vlan TX dhcp-address-range 10.21.192.15 - 10.21.192.25
configure vlan TX dhcp-options default-gateway 10.21.192.4
configure vlan TX dhcp-options dns-server 10.10.10.135
enable dhcp ports 1:1-20 vlan TX

RE: x440G2 DHCP DNS option

Patrick_Voss — Mon, 20 Feb 2017 23:03:00 GMT

For clarification, all the devices on ports 1:1-20 are receiving the 10.21.192.4 address as the default gateway and the dns server?

Also, for 21.1.1.4 there are two patches as of now 1-2 and 1-5. Are either of these showing when you do a "show switch"?

RE: x440G2 DHCP DNS option

Thomas_Handber1 — Mon, 20 Feb 2017 23:17:00 GMT

Sorry i'm using the 1-5 patch
Primary ver: 21.1.1.4
patch1-5
Secondary ver: 22.1.1.5

I have tried different ports with same result
Physical Address. . . . . . . . . : 2C-41-38-12-2B-E0
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.21.192.15(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.252.0
Lease Obtained. . . . . . . . . . : 20. februar 2017 17:09:09
Lease Expires . . . . . . . . . . : 20. februar 2017 19:09:09
Default Gateway . . . . . . . . . : 10.21.192.4
DHCP Server . . . . . . . . . . . : 10.21.192.4
DNS Servers . . . . . . . . . . . : 10.21.192.4

RE: x440G2 DHCP DNS option

Thomas_Handber1 — Mon, 20 Feb 2017 23:19:00 GMT

Slot-1 Stack.7 # sh dhcp-server VLAN "TX":
DHCP Address Range : 10.21.192.15->10.21.192.25
Netlogin Lease Timer : Not configured (Default = 10 seconds)
DHCP Lease Timer : Not configured (Default = 7200 seconds)
Default Gateway : 10.21.192.4
Primary DNS Server : 10.10.10.135
Ports DHCP Enabled : 1:1-20

===========================================================================
IP MAC State Lease Time Left
===========================================================================
10.21.192.15 2c:41:38:12:2b:e0 Assigned 0001:57:40

RE: x440G2 DHCP DNS option

Thomas_Handber1 — Tue, 21 Feb 2017 16:55:00 GMT

Talked to support and the problem is fixed with image 21.1.3.7
And should also be fixed in 22.2 when that is being released.

RE: x440G2 DHCP DNS option

Johann_Smith — Tue, 21 Feb 2017 17:10:00 GMT

Dear Thomas, we had similar issues on a x460G2, this is the config that finally worked for us;

configure vlan vlanName dhcp-address-range 10.10.10.2 - 10.10.10.254

configure vlan vlanName dhcp-lease-timer 3600

configure vlan vlanName dhcp-options default-gateway 10.10.10.1

configure vlan vlanName dhcp-options dns-server 8.8.8.8

enable dhcp ports portNumbers vlan vlanName

configure vlan vlanName dhcp-option code 15 string "internal.domain.com"

configure vlan vlanName dhcp-option code 119 string "internal.domain.com internal02.domain.com internal03.domain.com"

# alternative in HEX for code 15

configure vlan vlanName dhcp-option code 15 hex 69:6e:74:65:72:6e:61:6c:2e:64:6f:6d:61:69:6e:2e:63:6f:6d

And yes we did have code 15 in string and in hex before it finally worked

Hope this gives some guidance.

Regards,
Johann