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New Member

SF300 dhcp relay

Hi all, i have allready read a lot of information, but steal don't know ther answer, please help

DHCP server is allocated on 2911 router (c2900-universalk9-mz.SPA.152-1.T.bin)

on SF300 (l3 mode):

interface vlan 8 - 192.168.8.2/24

interface vlan 18 - 192.168.18.1/24

interface vlan 4 - get ip with DHCP option

to port 3 (access vlan 18) is connected device with get ip with DHCP option

on 2911 there is access-list, that tells us that some device's from vlan 8 all the time are sending request on port 137 and 138 but not from others vlan's

Nov 14 11:50:10: %SEC-6-IPACCESSLOGP: list test permitted udp 192.168.8.78(137) -> 192.168.222.1(137), 1 packet 

Nov 14 11:50:12: %SEC-6-IPACCESSLOGP: list test permitted udp 192.168.8.62(138) -> 192.168.222.1(138), 1 packet 

screenshots are atteched

DHCP relay in enabled (tried with and without option 82)

dhcp server ip address (192.168.222.1) is nearest interface of 2911 (is accessable from each vlan)

to DHCP relay interfaces are added vlan 18 and vlan 4

in UDP relay there are port's 137 and 138 added for source ip interface vlan 8, vlan 18 and ALL

Everyone's tags (4)
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New Member

SF300 dhcp relay

addition about routing:

default gateway is 192.168.8.1 (as you can see, it belongs to vlan 8)

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