Got it
Enterprise
Community Forums Switches
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 05:52:05 558 4 0 0
  Rewarded HiCoins： 0 (problem resolved)
display all floors #1
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.

  • x
  • convention：

I have this problem too (0) Favorite(0) Share Report
Previous: Can i run SFP+ in 1000M mode? ( multibitrate SFP+ module )
Next: error message in switch S5720
Featured Answers

Recommended answer

(0) (0)
Scott_Qing
Created Mar 1, 2019 05:52:05 Helpful(0) Helpful(0)

@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：
All Answers
sim_157
sim_157 Created Feb 28, 2019 06:54:03 Helpful(0) Helpful(0)

@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 .
View more
  • x
  • convention：
BangorUni
BangorUni Created Feb 28, 2019 08:17:43 Helpful(0) Helpful(0)

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?
View more
  • x
  • convention：
chenhui
chenhui Admin Created Feb 28, 2019 09:35:19 Helpful(0) Helpful(0)

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
View more
  • x
  • convention：
Scott_Qing
Scott_Qing Created Mar 1, 2019 05:52:05 Helpful(0) Helpful(0)

@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：
Back to list

Comment

Advanced
B Color Image Link Quote Code Smilies
You need to log in to comment to the post Login | Register
Comment

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."

My Followers

Login and enjoy all the member benefits

Login
Huawei Website Support About Huawei Privacy User Agreement Terms of Use Cookie Settings
Huawei Enterprise Huawei Carrier Forum Training & Certification

Copyright © 2020 Huawei Technologies Co., Ltd. All rights reserved.

APP

Huawei Enterprise Support Community
Huawei Enterprise Support Community
Block
Are you sure to block this user?
Users on your blacklist cannot comment on your post,cannot mention you, cannot send you private messages.
Reminder
Please bind your phone number to obtain invitation bonus.