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DHCP Snooping Block DNS Packet
Hi, I've just encounter an issue with my GS724TPv2. As soon as I enabled the DHCP Snooping mode, I cant make dns resolving. Trusted Inferfaces are ok, and I retrieve an Ip from my dhcp server (w...
Hi, that happened to me, what I did to solve the problem was to install the firmware
more recent, since the firmware 1.0.0.24 that brought that switch is the cause of the problem.
Hi DaneA,
I did as you said :
-DL the firmware
-Factory reset
-Flash the firmware
-I tried to import my previous configuration > same error
-Factory reset N°2
-Minimalist configuration (2 vlans, switch ip, dhcp snooping on/off) > The same problem occurs, as I enable the dhcp filtering > no dns traffic
The 3 GS724TP are new, first configurations testing last week.
Thx for any further advice
Hi again,
I tested in the lab and I have the same problem as you. I confirmed with a packet capture that the switch allows the DNS request to travel up the network, but the DNS response is blocked. It the exact way that DHCP snooping works, but of course this should not be applied to normal DNS requests.
I will need to log this issue to our R&D department. I suggest you use ACLs in the meantime to help combat this. I will send you a PM and we can take it from there.
Thanks!Thx, i'll reply to ur PM as i get all the informations u asked.
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