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udp-helper server 10.20.0...

udp-helper server 10.20.0.255, is a broadcast address allowed?

Created: Feb 27, 2019 15:04:59Latest reply: Mar 1, 2019 05:52:05 790 4 0 0 0
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This post was last edited by BangorUni at 2019-02-28 08:16.

udp-helper enable

udp-helper port 402


vlanif 100

ip address 10.1.1.1 24

udp-helper server 10.20.255.255


1. There are many hosts on 10.20.0.0 16 (vlan 620) which all need to be sent udp 402 broadcast packets from a WoL server which lives in vlan 100 so will this work? As these PC's are asleep they do not own IP addresses so need a "magic packet" sent to vlan 620.


2. What happens to the original broadcast packet 255.255.255.255 sent from the WoL server? Is it duplicated and the duplicated packets destination is rewritten with the udp-helper server address and it still broadcasts locally within vlan 100 using 255.255.255.255 or does the switch now only use the udp-helper address and discards the original broadcast packet with destination 255.255.255.255 so it never broadcasts locally within its own vlan 100?


Hope this makes sense.


Thank you.

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Scott_Qing
Created Mar 1, 2019 05:52:05

@BangorUni hi, I tried with cisco on the eve-ng, and it works, but when configure the server address was configured a broadcast IP, the router should enable the directed broadcast, so that the router would forward the directed broadcast,
hope this could help you.
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sim_157
sim_157 Created Feb 28, 2019 06:54:03

@BangorUni hi, the udp-helper server address can't be assigned a broadcast IP addrss,
about the question 2, I think the device will broadcast the packet and also forward the packet to the server .
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BangorUni
BangorUni Created Feb 28, 2019 08:17:43

I just found this:

https://support.huawei.com/enterprise/en/doc/EDOC1000174046/8f051fab/udp-helper-configuration-commands#udp-helper_server

it states that the ip-address can be a subnet broadcast address, so 10.20.255.255 should be allowed?
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chenhui
chenhui Admin Created Feb 28, 2019 09:35:19

Posted by BangorUni at 2019-02-28 08:17 I just found this:https://support.huawei.com/enterprise/en/doc/EDOC1000174046/8f051fab/udp-helper-co ...
as the documentation said, the server IP address can be assigned a broadcast IP address
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Scott_Qing
Scott_Qing Created Mar 1, 2019 05:52:05

@BangorUni hi, I tried with cisco on the eve-ng, and it works, but when configure the server address was configured a broadcast IP, the router should enable the directed broadcast, so that the router would forward the directed broadcast,
hope this could help you.
View more
  • x
  • convention：
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