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dhcp
5 Topics
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 (which is the same as my dns server). I can ping, go to web servers (with their ips). If I turn off DHCP snooping mode, it works again (mac address validation didnts seem to have an impact), I can see my computer informations in the dynamic binding configuration screen. I have 3 724tp connected with LACP, i tried with one switch alone, no results I have DHCP snooping/filtering set up on my other switches (GS724T no POE) and I dont have this issue. If anyone has an idea (misconfiguration, bug,...) ? Thanks a lotSolved4.6KViews0likes8CommentsDHCP not traversing switch Part 2
Hi, Unfortunatly I have a follow up issue to my last issue here. This time however only the Netgear is involved. I have performed various tests already and it boild down to that the S3300 does not seem to pass on DHCP traffic at all at the moment. Test setup: I have a box A on Port 12 and a box B on Port 13. On B there is a dhcp server active and tcpdump on 67/68 udp. I start a dhcp request on box a connected via Netgear switch - I don't see any requests. On Box A I can see the requests being sent out with wireshark, but o/c no replies. A static IP on Box A results ins perfectly fine communication, no issues. Now I used another switch (cheap 8 port) and attached box A and B to it and with that switch DHCP is working fine, tcpdump listing everything. Both boxes are on VLAN 1, no security features active, no helper, relay or anything. S3300 (stack of 2) is on latest FW (6.6.4.7) but I think the issue was present before. I noticed weird behaviour for about 2 weeks but can't really tell what I could have changed to cause this :( Lost again :(Solved17KViews0likes17CommentsDHCP Response not traversing stacked switches
Hi, hopefully only another user error, but at the moment I am out of ideas again. I have 2 S3300's (FW 6.6.17) [A1,A2] connected via stacking in 2 different rooms. On one of the 10G Ports another switch (B) is connected via Trunk, on that switch a bunch of boxes are connected. I have issues getting DHCP to work over the two stacked switches, all regular traffic (non broadcast i suppose fine). Local DHCP within Switch B is working fine, as is DHCP only using A1 (have not tested "A2 only"), but not the routes "Client ->A1->A2->B" or "Client->B->A2->A1". I can see DHCP Offers cross the line reaching my DHCP servers (one 2012 DHCP, one linux based one) on each room, but no actual DHCP replies get sent back. I have one client and one Server in A1, one Client and one Server in B (VMs) I have setup port mirroring on the uplink port 1/28 (which is on A2 and connected to Switch B) and capture DCHP Requests from B->A1, but the DHCP Server on A1 does not see them. I have set up a client on A1 requesting from B and can see requests arriving on B but the answer never arrives back at A1 So basically traffic flows as follows: Client (in either room) sends out DCHP request, this get received by DHCP server in other room. DHCP Server replies with OFFER, but OFFER never reaches Client. I used wireshark/tcpdump/port mirroring to verify this behaviour but can't really explain it :( Easiest would be to break the stack and just link them via trunk but that can't be it... Any idea how to troubleshoot this? ThanksSolvedDHCP Host
I see that the switch can be a DHCP client, but can it be a DHCP host? I want to create a standalone network and don't want to have to add an additional device just to do DHCP assignments. (Yes, I know I can use a cheap RasPi, That also eats a port). I want to be able to have 8 laptops connect and the switch serve up IP addresses for them.Solved5.7KViews0likes2CommentsGS1xxE and their PoE equivalents. Getting them an IP using DHCP on a specific vlan.
Hello to anyone taking the time to read this. I have close to a dozen netgear GS1xxE switches at my home and various family member's homes by now and swear by the things. Vlan tagging is a must for our various setups and these switches haven't disapointed yet. However , when it comes to configuring them, the fact one is incapable of selecting the vlan on which the things do their DHCP negotiating forces me to use fixed IP's. In essence this isn't all that bad. But knowing adding this to the firmware isn't something unreasonable to ask I would like to know how I would best go about asking this to Netgear. http://i.imgur.com/JZEvBx4.png http://i.imgur.com/p9evrYY.png Thank you for any reply.Solved