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How many IP helper-addresses can I have on an E0/0 interface?

g-parks
Level 1
Level 1

How many IP addresses can I safely configure on my e0/0 interface? The configuration is below is an example of what I am using. This is configured on a router with a 56k cir.

Additionally, the router is configured to not forward udp netbios. (see below)

What kinds of problems can I expect to see?

interface Ethernet0/0

ip address 192.168.207.254 255.255.255.0

ip helper-address 192.168.101.x

ip helper-address 192.168.1.x

ip helper-address 192.168.11.x

no ip directed-broadcast

no cdp enable

bridge-group 7

bridge-group 7 input-address-list 7

no ip forward-protocol udp netbios-ns

no ip forward-protocol udp netbios-dgm

3 Replies 3

thisisshanky
Level 11
Level 11

You can configure more than one ip helper-address like what you have done, without harm. I guess you are using directed broadcasts for that subnet. as the ip helper-addresses. You will see that the router will send the broadcasts to each of the above helper-addresses. In this case, it will send 3 packets for every broadcasts received.

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus

Thanks for your response. If it sends 3 broadcast packets for each one it receives then this will probably affect the 56k circuit consuming bandwitdh with broadcast, right?

Yep...it would...What is the purpose of using 3 IP helpers ??

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus
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