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Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

frodolicious
Occasional Contributor

Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

Default VLAN: 10.36.0.0/24 New VLAN : 10.36.8.0/24 DHCP server : 10.36.0.17

I can see the DHCP offer packets making it back to my VLAN ip address namely 10.36.8.31 (from dhcp server message log)

Apr 28 15:33:13 dhcpd: DHCPOFFER on 10.36.8.129 to via 10.36.8.31

However the dhcp offer never makes it back to my machine connected to the new vlan(verified with wireshark as well)

The switch is HP Layer 3 Procurve. Any suggestions as to why the DHCP offer cant hop from 10.36.8.31 to my machine on same subnet?

Running-Config(some details redacted)

Running configuration:

*; J9588A Configuration Editor; Created on release #KA.15.17.0008



*module 1 type j9588y

 module 2 type j9588x

-fault-finder broadcast-storm sensitivity high

fault-finder bad-driver sensitivity high

fault-finder bad-transceiver sensitivity high

fault-finder bad-cable sensitivity high

fault-finder too-long-cable sensitivity high

fault-finder over-bandwidth sensitivity high

fault-finder loss-of-link sensitivity high

fault-finder duplex-mismatch-hdx sensitivity high

fault-finder duplex-mismatch-fdx sensitivity high

fault-finder link-flap sensitivity high

jumbo ip-mtu 9000

power-over-ethernet redundancy n+1

qos tcp-port ipv4 22 priority 7

qos tcp-port ipv4 80 priority 1

qos tcp-port ipv4 443 priority 0

qos type-of-service diff-services

timesync sntp

sntp broadcast

sntp server priority 1 10.36.0.17

sntp server priority 2 10.36.0.18

no telnet-server

time daylight-time-rule western-europe

no web-management

web-management ssl

ip default-gateway 10.36.0.1

ip dns server-address priority 1 10.36.0.17

ip dns server-address priority 2 10.36.0.17

no ip ssh cipher aes128-cbc

no ip ssh cipher 3des-cbc

no ip ssh cipher aes192-cbc

no ip ssh cipher aes256-cbc

no ip ssh mac hmac-md5

no ip ssh mac hmac-sha1-96

no ip ssh mac hmac-md5-96

ip route 10.36.8.0 255.255.255.0 10.36.8.1

ip routing

snmp-server community "public" unrestricted

tls application web-ssl lowest-version tls1.2

tls application openflow lowest-version tls1.2

tls application syslog lowest-version tls1.2

tls application tr69 lowest-version tls1.2

aaa authentication ssh login public-key

oobm

   ip address 10.36.0.35 255.255.255.0

   exit

router rip

redistribute connected

   exit

vlan 1

   name "DEFAULT_VLAN"

   no untagged 20-21

   untagged 1-19,22-52

   ip address 10.36.0.31 255.255.255.0

   ip helper-address 10.36.0.17

   ip igmp

   exit

vlan 8

   name "WiredUsers"

   untagged 20

   ip address 10.36.8.31 255.255.255.0
ip helper-address 10.36.0.17

   ip igmp

   exit

spanning-tree


 

 

6 REPLIES
Vince-Whirlwind
Honored Contributor

Re: Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

You can get rid of this, for a start:

ip route 10.36.8.0 255.255.255.0 10.36.8.1

 

Apart from that, you should confirm connectivity first, patch your laptop to port 20, give it a 10.36.8.... address and see if you can ping the DHCP server.

 

16again
Respected Contributor

Re: Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

ip route 10.36.8.0 255.255.255.0 10.36.8.1

What's the use of line above in your config?
This subnet is already directly attached, automatically inserting a "connected" type route in routig table.
However , if the line above does have effect, it might break connectivity

 

Vince-Whirlwind
Honored Contributor

Re: Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

Like 16again, I am dubious whether this line actually does anything bad.

But we are both 100% certain it can't be doing anything good.

frodolicious
Occasional Contributor

Re: Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

Hi Vince, thanks for your reply. I have removed the offending line, it doesn't make a difference. As you correctly surmised, I don't seem to have connectivity. I can ping the switch address in the 10.36.8.0/24 subnet but not anything in the 10.36.0.0/24 subnet. Any ideas on what I need to configure to be able get out into the default vlan?

Thank you!

 

frodolicious
Occasional Contributor

Re: Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

The solution to this was that there was no proper route from the dhcp server to the vlan. It worked after I added a

sudo route add -net 10.36.8.0/24 gw 10.36.0.31 dev bond0 (where 10.36.0.31 is the address of the vlan) on the dhcp server. Thanks for taking the time to respond, all!

Vince-Whirlwind
Honored Contributor

Re: Intervlan routing--DHCP offer from server on default VLAN doesnt reach new VLAN

I have come across peopl.e using their Unix servers as routers, so apologies if this is wide of the mark - but why don't you just have a default route on your server?