Cisco Switches :: Slow Dhcp With ESW 520
Sep 12, 2012it's probably a setting to do on ESW 520 but all my DHCP is slow when I use ESW 520.With an other switch, I haev no problem.
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Cisco WAN :: 877w Slow In Sending DHCP IPs
Jan 17, 2011I got the wireless up and working. one more issue, its that the clients take time to get an ip address and the ok light on the routers wireless side is blinking and not steady lit.
how do i get it steady and decrease the time for the clients to receive the ip address, both lan and wifi.
Cisco Switches :: 2620 DHCP Through VLAN
Jan 18, 2013I have a 2620 Cisco Router plugged into a 2924 Cisco switch by a trunk.The vlan configuration works, I subdivide my router interface with dot1q and have virtual machines on different vlans and everything works perfectly.The problem comes with a DHCP request.Let's say that I have my local lan on the native VLAN 1. I create a VLAN 25 in the switch and create a fa0/0.25 in the router.In the switch, I plug the cable modem from my ISP in a port on vlan 25In the router, I go to fa0/0.25 and issue "ip address dhcp".The DHCP request goes out, but never comes back. The problem seems to be in the switch because if I try the same thing with a virtual machine I have on a trunked VMWare ESXi server, I get the exact same results. I just don't get the IP address from the ISP.The next step would be to monitor the port on which the cable modem is connected and sniff the packets to see if the DHCP request actually gets back through.
View 2 Replies View RelatedCisco Switches :: SF 300 Works As DHCP Server?
Dec 26, 2012know any plan from Cisco to make 300 series switch to work as a DHCP server?
View 1 Replies View RelatedCisco Switches :: DHCP Over LAG Between SG200 And SG300
Apr 17, 2013I have an SG300-10 and an SG200-26. I also have an OpenWRT flashed router that can tag VLANs.My problem right now is that my default VLAN is 1, my router is doing DHCP in VLAN 1, and I want all my network equipment to be on VLAN 1, but my SG200, when LAGed to the SG300, will not get an IP.My SG300 is pulling an IP just fine from my router DHCP pool. When I connect the SG200 directly using either 1UP port settings or 1TP port settings, I get an IP just fine. When I LAG my connection (ports 1-3 on both) I get no DHCP information sent through the LAG to either the SG200, nor to any client devices that are set for DHCP.
View 7 Replies View RelatedCisco Switches :: SRW2024P-K9-XX DHCP Snooping
Jul 24, 2012I have an issue with SRW2024P-K9-BR (SG300). Datasheet and configuration guide show me that is possible configure DHCP snooping in this switches, but web interface and console don't appear related menus/commands.
I'm using firmware version 1.1.2.0 and didn't found anything about this here.
Cisco Switches :: SG200-26 PXE DHCP Through A Teamed LAG
Feb 12, 2012I am having issues getting clients to DHCP off of a teamed adapter through the Cisco Switch. If I run a one to one cable from the server to the switch it works fine, but when I switch over to the Intel QuadNic in Team Mode then the PXE clients do not get a DHCP address from that server anymore.
I have configured the Team mode on the Windows Server 2008 R2 and given the and configured the LAG with the 4 plugs on the Cisco SG200-26 switch in the LAG Management. It says the link is up and if I give the client a static IP I can ping the server and the server can ping the switch.
Cisco Switches :: SGE 2000 - DHCP Relay
Oct 15, 2009I have defined several V LAN's and the corresponding IP Addresses on the SGE2000. The static routing works fine. On one V LAN there is a Windows 2003 DHCP Server which I have defined as DHCP Relay Server (Option 82), but no packets are relayed. Has anyone a functional setup, with dhcp relay?
View 8 Replies View RelatedCisco Switches :: SGE2010 - Cannot Get DHCP Working
May 28, 2013We have a single SGE2010 in layer 3 mode switch with a Server 2008 DHCP server.
We will be implimenting a Voip netowork where the PC's connect to the voip phone. I would like to create another vlan - 10. I have created the vlan and assigned the IP on the swtich.
Routing seems to be working. I can ping both IP addresses of the switch on either vlan.
I cannot get DHCP working. In the SGE switch I have enabled DHCP Relay, enabled option 82, set my DHCP Interface as VLan1, and specified the DHCP servers IP address. On the ports I have set the port where the DHCP server connects to as a trunk port with Vlan 1 untagged and vlan 10 tagged. I have set the ports where the phones connect as a trunk port with vlan1 untagged and vlan 10 tagged.
Cisco Switches :: Configure DHCP Server Options For SMB 300?
Nov 28, 2011I am looking for a how to configure a DHCP server for a Cisco SMB 300 series switch to obtain an automatic configuration. Currently i am using a Cisco 1800 router as my DHCP server and the DHCP pool serving the 300 series switch is configured as follows.
ip dhcp pool Cisco_SMB_300
network 192.168.0.0 255.255.255.0
default-router 192.168.0.1
[Code]......
Looking at pcaps, I don't even see a tftp request going the server after the switch obtains an IP via DHCP. The config file format is exactly as obtained from the download backup section (pretty sure its not the issue since i don't see a download attempt). Also, the SMB switch is running the latest firmware image (1.1.1.8)
Looking though the admin guide i did not see specifics on how the DHCP server was to be configure for the auto configuration feature to work.
Cisco Switches :: SG300-28P DHCP Server With New Firmware?
Jun 15, 2012we are looking to use the new firmware's DHCP server feature to setup different DHCP scopes for 5 different VLANs configured on the switch. I see where to turn this on and setup the scope however I can't clearly see where I can assign the specified scope to each VLAN on the switch.
View 6 Replies View RelatedCisco Switches :: DHCP Cable Modem On Vlan SF 300-8
May 19, 2011I have Multiwan router with 1 port WAN and 4 DHCP Cable modem connected to SF 300-8. I want to connect 4 modem via VLAN through switch. I define Vlan2,3,4,5 on router also in Switch. port 1 on the router as trunk and the other port 2,3,4,5 as Vlan2,3,4,5 with VLAN mode Access. I tag port 1 on every VLAN also Untagged for each port. I having problem when I check the status from multiwan router. all IP address is the same (duplicate). what I want is each VLAN has own DHCP Address. Is that any miss configuration ?
View 6 Replies View RelatedCisco Switches :: 300 - VLAN DHCP Packets Not Passing?
Jul 29, 2012I am seeing a problem with our Cisco 300 switches. We use these switches as access switches, with a stacked 3750-G at the core, two 2960-S at the distribution layer, and about 10 300 Series switches at the access layer (10 port and 28 ports, all PoE).
We use Voice VLAN (VLAN 14) for our Mitel phones – there is a DHCP server on the Mitel system. Phones come up, get tagged VLAN 14 (LLDP), Traffic flows (including Broadcast for DHCP etc…). The system works, and has worked for months.
One day, suddenly, I find that all the Mitel phones on a particular access switch are not working. I look on the Mitel system and the lease on DHCP has expired, and the phone is stuck on renewing its DHCP IP address. I run port mirroring on the switch for VLAN 14 to see what is happening. The phones are stuck on DHCP discover, and I see the DHCP Discover broadcast packets on the switch but nothing else, no DHCP offer packets – hence the phone stuck at boot cycle.
I then do a port mirror from another access switch (that is currently working) – I can see the broadcast packets from the Mitel phones on the broken switch, but on this switch I can also see the DHCP offer packets from the Mitel system. I run two port mirrors simultaneous from the two switches (one working, one not) and I can see that the DHCP offer packets are not coming through to the broken switch. Panic ensues – I look at the distribution layer and there is no problem what so ever.
For some strange reason, the Cisco 300 28 port has stopped passing DHCP broadcast packets on a particular VLAN, even though they are being sent. I power cycle the switch – and hey presto, DHCP offer packets are coming through, and the phones get an IP address and boot properly.
Forward a couple of weeks later, and to today. I have another phone that is showing the same symptoms, luckily it is the only phone on this particular Cisco 300 28 port. The same issue is occurring as described above. I gather as much diagnostic information I can then reboot the switch – but still no joy. I then remember that this switch is not directly attached to the distribution layer and instead gets trunked to another Cisco 300 28 port. I give that a reboot and 5 minutes later, DHCP broadcast offers are passing and the phone boots.
I am listing this problem as not just a ‘one off’ now, and is recurring. It has happened to two of my 300 28 port switches.
All Switches running 1.1.2.0. No link to up time – first instance of the problem, switch was up for 14 days – second instance (another switch) uptime of 39 days LLDP is working fine on the switches, as is Voice-VLAN (Port is tagged and broadcasts out DHCP Discover which is seen by other devices throughout network) Nothing in the log file on the access switch Nothing on the Dist/Core regarding STP – Spanning tree set up is fine throughout.
Cisco Switches :: SRW224G4 - DHCP NAK Responses For Macbook
May 8, 2013After some wireshark, I see that when I have a vLan on the switch, only win7 gets IP, my macbook doesn't, sniffing to the bootp, I see that the DHCP sends NAK and after I only have DISCOVER & OFFER...
When I get the same switch and the same router and take out the vLan on the switch, everybody get an IP. What's the deal with this switch and vLans and Mac OS x ? Do I have to setup something else ?
Cisco Switches :: SG300-28P DHCP Server With New Firmware
Apr 9, 2013we are looking to use the new firmware's DHCP server feature to setup different DHCP scopes for 5 different VLANs configued on the switch. I see where to turn this on and setup the scope however I can't clearly see where I can assign the specified scope to each VLAN on the switch.
View 1 Replies View RelatedCisco Switches :: DHCP Relay On A SGE2000 Switch?
Jun 25, 2012DHCP Relay on a SGE2000 switch.I have configured two VLANs on the switch, VLAN2 (192.168.10.x/24) and VLAN3 (192.168.9.x/24). I have the switch in Layer 3 mode. I have configured the DHCP relay server of 192.168.10.4 and the DHCP Interfaces as VLAN3. All of the IP Static Routes were generated by the switch.
If I put a client computer on a port that is Untagged VLAN 3 and try to get a DHCP address from the server on an Untagged VLAN 2 port I never get a response back.I have done some packet captures and here is what I have found:
I see the DHCP broadcast on the client computerI see the DHCP Request on the DHCP server coming from the IP assiged to the switch on VLAN 3 (192.168.9.254)I see the DHCP server respond with a DHCP OfferThe DHCP offer never gets to the client computer I can't seem to get a DHCP address to any system not on the same VLAN as the DHCP server. Option 82 is disable and I did try enabling it, which made no difference.
Cisco Switches :: SRW248G4P Supports DHCP Relay
Feb 12, 2013Does SRW248G4P supports dhcp relay?I don't see any option for it with firmware version 1.0.2.
View 1 Replies View RelatedCisco Switches :: SLM2008 - Filters Out DHCP Discover
Sep 16, 2012I'm new on this site and having SLM2008 switches. I've been trying to solve the problem for quite a while, but so far I was unable to solve it. So here it is:
I'm trying to send IP TV from ADSL box (aka Free box) located in a small annexe of the house where the telephone line enters. Whole house is wired with 1Gb CAT6 cable. I'm using this wiring to get internet connectivity in different parts of the house and this works great. Now the idea was to create a separate VLAN on my 3 SLM2008 switches to get IP TV stream from ADSL box to the media box (also provided by ISP, aka Freebox HD). Different V LAN configs did not work for me: Free box HD would stuck on boot claiming it doesn't "see" the network. So then I've decided to go from simple things to more complex and removed the V LAN (came back to default config) and connected ADSL box with Free box HD with just one SLM2008 in between. Surprisingly it did not work! Same error on Free box HD! So I plugged the hub and started my Wire Shark to see what is going on.
First tried without the switch (just with a hub in the middle) and I saw successful connection:
1) Freebox HD send DHCP Discover
2) ADSL box responds with DHCP Offer
3) HD sends DHCP Request
4) ADSL issues a DHCP lease
Free box HD is ready to show any channel from ISP.
Secondly I plugged SLM2008 back and looked at traffic right after ADSL box: No DHCP packets seen at all! Then I moved hub next to Free Box HD and I saw it keep sending DHCP Discover every 30 seconds or so.... And it was not getting reply back.
So my conclusion is that SLM2008 for yet unknown reason would not let DHCP discover pass.... I've tried un managed Net Gear switch and *boom* Free box HD booted without a problem. I looked through SLM2008 settings and I have not found something relevant.
How to make my switch pass DHCP discover? If yes my next question would be how to configure V LAN on 3 switches to make it deliver IP TV to my TV set.
Cisco Switches :: SG300-28 - Configuration As DHCP Server
Aug 28, 2011I am relatively new the configuring network switches. Could someone point me in right direction to configure SG300-28 as a DHCP server?
From the people I talked based on device specs it should be able to act as dhcp server. However, if we cannot, can it be configured so that clients get DHCP information from Firewall to which L3 switch is connected.
Cisco Switches :: DHCP Option 82 On SG-300-10 Port Switch
May 5, 2013I have sample lab dhcp-client ------- (vlan62) sg-300 switch (vlan62) ------ dhcp server
When I set on switch :
dhcp relay : enable
option 82 : enable
dhcp server address: ip of dhcp
When debug packets from client to server, there is no 82 option in dhcp discover packets. I mirror all traffic to mirror port with wireshark. I can see dhcp packets but without option 82.
Firmware version: 1.0.0.27
Cisco Switches :: SF300 Does Not Support Complete DHCP?
Apr 5, 2013I have some issue from last 2 month on sf300.
The problem is that sf300 does not support complete dhcp, for that i put different internet modem.
I connected one internet modem in vlan 1 so users from that vlan can access internet and default gateway is nothing but Internet modem ip. user in the vlan are not communicate with other vlan because, other vlan users default gateway is Interface ip address. How i can give access to vlan 1 to access other vlan .
See the attached.
I have to used static route in all 3 devices or any one.
Cisco Switches :: SG200-26P / Loading Webpages Sometimes Very Slow
Mar 5, 2013I recently bought a Cisco SG200-26P and now loading webpages are sometimes very slow or don't load at all.I have to refresh to page to load at all and sometimes even restart safari to load the webpages.I have this on several macs and ipads.
View 3 Replies View RelatedCisco Switches :: How To Configure In SF300 To Take Dhcp Service From Router 827
Feb 16, 2013I have struck in my some network configuration. I have two sf300 switches and cisco 827 router. Actually sf300 does not support dhcp server. I took cisco 827 as dhcp server and i create 4 dhcp pools in it. How i can configure in sf300 to take dhcp service from cisco router 827. Isit possible to configure 827 with bvi interface, when i was try i got below error. how to configure bvi interface and i will link that bvi to vlan on sf300. error in 827 router, How i can connect two sf300 switch for redundancy ? I connected giga4 SW1 and giga4 SW2 and mode trunk isit good or any other way i need to connect it.?
View 3 Replies View RelatedCisco Switching/Routing :: DHCP Limitation On 3750 Switches?
Jul 16, 2012I want to clear following things regarding Cisco 3750 switch.
1. Can I configure Multiple DHCP pool on C3750?
2. Performance effect due to same?
3. Can I resrve IP addrese from DHCP pool for specific MAC address.
4. Can I Exempt IP address from DHCP pool ?
Cisco Switches :: Error Configuring DHCP Server On SG300?
Apr 5, 2013Firmware 1.3 introduced a DHCP server.
It seems that I can add a pool for any subnet except the 192.168.1.1/24. I have successfully added a pool for 192.168.0.1/24, 172.16.16.1/24, etc. But when I use the same commands to add a 192.168.1.1/24 pool, I get:
sw(config)#ip dhcp pool network Device sw(config-dhcp)#address low 192.168.1.20 high 192.168.1.250 255.255.255.0 Illegal IP addresses range or subnet configuration Trying to configure a network pool on default IP interface
VLAN 1 IP was changed from default 192.168.1.254 to a static of 192.168.0.1.
Cisco Switches :: SG200-18 Fails To Pass DHCP Requests?
May 30, 2013I have a sg200-18 connected via one of the ports to my ISP's router/modem. Using an unmanaged switch everything works as expected, but after a few days on my sg200 my two computers fail to get assigned IP's and cannot connect to anything. I also have a couple printers that seem to have no problems getting their IP's passed through to the router as I can use them fine from my machines when connected to the unmanaged switch.
Is there a possibility I don't have my switch setup properly to know that all outgoing data must go to the router, or UDP traffic is being dropped somehow?
Cisco Switches :: SG300 DHCP Static Reservations Are Not Working
May 19, 2013I'm having troubles with this firmware in a SG300-28 switch. Actually the DHCP server, a new feature in this firmware release, doesn't work correctly. DHCP static reservations are not working: CLient ID and MAC address are not recognized correctly, and the DHCP server assigns the first free IP in the pool, rather than the reserved one.If Cisco engineers read this, plese correct the issue.
View 5 Replies View RelatedCisco Switches :: SG500-28P Slow Switch Uplink Connectivity
Feb 26, 2013At our office we have a weird performance problem with the following switches and connectivity:
Internet |
SG300-24 (L3) core switch (in our server room)
|SG300-10P (L2) access swtich (in our meeting room) |
SG500-28P (L3) switch (in our meeting room)
We are building a new computer infrastructure that is connected to the the SG500-28P. As you can see above the SG500-28P in our meeting room has an uplink to the SG300-10P in the same meeting room. And again the SG300-10P has and uplink to the SG300-24 in our server room. From the server room, there is connectivity to internet. The network uses a multiple VLAN's and routeing between them. Bootom line is, the internet VLAN ID 10 is tagged to trunk ports and available on the SG500-28P. So client get connected straight into the internet based VLAN.
The performance on the SG500-28P switch itself from VLAN to VLAN is very fast. But... the uplink connection tot the internet and other VLAN's on the core switch are very and very slow! At least 10 times slower than normal. So if I plug a laptop in the SG500-28P and go from uplink to uplink, it is slow! But... when I connect the same laptop to the SG300-10P the connection with only one uplink it is fast. As if three switches is to much. I can't figure out why.
Routers / Switches :: Loosing Connection From A DHCP Router?
Jan 16, 2012We are in a hotel that allows us to use their router with a Hawking 300N expander. We seem to lose connection each time their router gets a new IP address. The router seems to lose connection frequently. Is there a setting in the expander that will allow the expander to "follow" the DHCP address of the router without having to take it down and go thru the setup each time.
View 2 Replies View RelatedRouters / Switches :: Windows Xp Dhcp Force New Ip Address?
Jul 23, 2011I've set up a DHCP reservation on a Netgear wpn824v3 router, using its "Attached Devices" list to specify the MAC address of a computer on the network to use IP 192.168.5.200. After using "ipconfig /release" then "ipconfig /renew" on the client PC, though, the client PC keeps going back to the address it got automatically, i.e., 192.168.5.3.How can I force the client to use 192.168.5.200?
View 1 Replies View RelatedRouters / Switches :: Why Do DHCP For DLINK DSL-2540T Always Keep Disabled
Jan 5, 2011why do my DHCP for DLINK DSL-2540T always keep disabled although i already set for enabled one day before?
View 1 Replies View RelatedRouters / Switches :: Internet Connection Has Become Weak And Slow?
Nov 17, 2012My ISP tested my connection and told me my signal is very weak. I can no longer play games online because I lag tremendously. I can't steam videos while someone else is using the internet either. Also I can't access it on wireless devices unless I am in view of the router. I'm not sure what caused my connection to suck butI have the essential plan from cox.com. When I test my connection on speedtest.com I average 75ms/ping, 3.25mbps/dwnld spd, and
View 2 Replies View RelatedCisco Switches :: Getting DHCP Relay To Function Properly On SG300-20 Switch
Dec 5, 2012I am having some issues with getting DHCP Relay to fuction properly over our SG300-20 Switch.Out current layout is as follows. Hanging off the SG300-20 are a pair of Clustered Checkpoint Gateways with VLAN'ed interfaces in Both of our 2 VLANs, a 3COM 4200G In VLAN1 which has the DHCP server (And all the other Servers) connected to it, and a Pair of HP Procurve 2520's Stacked in VLAN 2 to provide PoE for our Phones/connectivity for our PCs.The problem is I cannot get the DHCP Relay to fuction from VLAN 1 to VLAN 2. If I assign an address in VLAN 2 manually to a device connected to the Procurves, everything works fine. I am able to reach both VLAN 1 and VLAN 2, but DHCP aquisition fails even if the device is connected directly to a port assigned to VLAN 2 on the SG300. The SG300 is running at Layer 3 currently also.
Here is a copy of the running config:
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switch4db24f#show running-config
vlan database
vlan 2
exit
interface range gi8,gi16
switchport default-vlan tagged
[code]....