Any good way to force a serial link to delay packets to simulate a hi latency WAN link? Found this command so far:
Router(config-if)# transmitter-delay hdlc-flags
I can dial the speed up/down via clock rate all good but I need to also simulate latency. This is for simulating a WAN bonding scenario so I was going to aggregate a 10M ethernet port with a 2M serial and a 512k serial. But I need to also ensure varying latency.
Is there a device, which is able to produce a time delay on fiber optical link? I mean for example if one would like to reduce the power level of an optical signal, he could use simple air-gap optical attenuator on optical link. However, has somebody seen a device, which is able to introduce a time delay on optical link?
View 6 Replies View RelatedI am using my new DCS-930L to monitor motion at a door entrance. It is firing off when motion happens but the image it emails is taken @ 12 seconds after the motion. So the result is I know motion happened but the person who came to the door is long gone or through the door by the time the image snapshot is taken. I get multiple emails containing images of the empty entrance. Is this a software, hardware, firmware or user error issue?
View 7 Replies View RelatedRegion : Vietnam
Model : TL-WR841N
Hardware Version : V8
Firmware Version :
ISP : VNPT on Vietnam
I have bought WR841 V8.3. Signal show is good, but i ping to router many timeout or delay when i open some website. Ping only geog when i near router.(some time delay)
I'm based in the UK and am using a DIR-655 router but I have no record of its serial number (there is no sticker on the item, and the original box is now missing) - is there any way I can ascertain which version of the router I have? As I understand matters, I need to know this so that I can apply the correct firmware upgrade, which is what I wish to do.
View 1 Replies View RelatedI'm an IT student and I've been assigned with homework simulating a network including an ISA server and some clients in Packet Tracer but I can't find anything which can be configured like an ISA (Internet Security and Acceleration) server(this is kind of Microsoft's technology as I know) in Packet Tracer, the generic Server from the devices box has only some basic services such as HTTP, DHCP, DNS, FTP, AAA, ... but none of anything related to ISA, all the servers in Packet Tracer have only 1 interface whereas the ISA server (as far as I know) should have at least two interfaces, and there is also no CLI supported for those servers so I think I can't simulate ISA server in Packet Tracer, can I?
View 4 Replies View RelatedWe have an ACS 4.2 installation and we have users configured on the user setup, they authenicate using the windows database (AD). We ran failure tests and simulated AD failure but disabling the firewall rule. So the ACS server is up, AD is down. Tested user login to a switch and get the following error. External DB user invalid. It looks like as the ACS does not get a response from AD it rejects the user login.
What we want it to do is in the event of AD failure is to be able to login to the switch with the username configured on the switch. (as if ACS server does not respond)
Date Time Message-Type User-Name Group-Name Caller-ID Network Access Profile Name Authen-Failure-Code Author-Failure-Code Author-Data NAS-Port NAS-IP-Address Filter Information PEAP/EAP-FAST-Clear-Name EAP Type EAP Type Name Reason Access Device Network Device Group 02/03/201214:09:13Authen failedtest.testNetwork192.168.1.1(Default)External DB user invalid or bad password....tty310.0.0.1..........SWITCH30Office
i have a home lab network that is connected to my internet. I basically have a linksys router connected to cable modem and in order for my families internet to not go down while testing and learning my CCNA I am trying to treat the Linksys as the ISP.
1. Plugged my 891W router via FASTETHERNET 8 (192.168.1.10) into LAN Switch port 1 of my Linksys E4200 home router(192.168.1.1).
2. I plugged my 891W Gigabit 0 (10.10.10.1) LAN side into my 2950 Catalyst Switch (10.10.10.5 - VLAN 1)
3. my 2950 Catalyst switch (10.10.10.5 - Vlan 1) is plugged into my 2600 series router via the routers FE port (10.10.10.2).
There is a few more routers connected behind r2 but I am not dealing with them right now and there is also a switch connected into s1 but its not being used for this.
891w is labled r1
2950 is labled s1
2600 is labeled r2
I am running RIP Verison 2 for my network protocol.
r1 information below
----------------------------
r1#show ip protocols*** IP Routing is NSF aware ***
Routing Protocol is "rip" Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Sending updates every 30 seconds, next due in 24 seconds Invalid after 180 seconds, hold down 180, flushed after 240 Redistributing: rip Default version control: send version 2, receive version 2 Interface Send Recv Triggered RIP Key-chain GigabitEthernet0 2 2 Vlan4 2 2 wlan-ap0 2 2 Automatic network summarization is in effect Maximum path: 4 Routing for
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I can ping all over my homelab everything I can reach as long as I have a protocol up but I cannot reach the WAN IPs. I watched video by Jeremy Ciorara and I tried to follow the wan and nat part from a website [URL] And none of its working. I am not sure if this is a case where a private IP cannot function as a ISP and I am breaking some rule thats not mentioned in CCNA studies or if its something else. I tried these commands from Jeremy Video:
r1(config)#ip access-list standard "NAT_ADDRESSES"
r1(config-std-nacl)#permit any
r1(config)ip nat inside source list NAT_ADDRESSES interface fastEthernet 8 overload
However they did not work it was pretty close to whats in the basic website up there I listed as well. I think I went back to the basic configuration in the config file post above. Its really frustrating as I follow directions and they do not seem to work. I understand I am using my private 192.168.1.0 subnet as an ISP and maybe that has something to do with it but when yoru first learning and things dont work its kind of overwelming as you have problems seeing the big picture and dont yet trust in things you have learned as they are unfamiliar so its easy to get lost.
I have run into a problem replacing an old Linksys BEFVP41 with a SA520. The BEFVP41 had an address on the LAN defined as a DMZ. That address was another router. It is in the same subnet as the local LAN and I am not sure what ports it uses. It is controlled by an outside group and requires much delay and paperwork to change the address. The new SA520 will only support a DMZ if it is in a different subnet than the LAN. Any way to simulate the old DMZ function on the newer router? I have not yet been able to obtain a list of all ports that should go to the second router. Didn't know if there was a way to forward all ports like the old BEFVP41 does by setting a DMZ address.
View 1 Replies View RelatedHow do I configure a data T1 serial link on a router using IOS 15 and a VWIC3-1MFT-T1/E1 module. The "interface serialx/x/x" are not there anymore?
View 1 Replies View RelatedMy objective is to analyze company network and enhance it.So I went to this company and ask them to give their network design.
View 2 Replies View RelatedI have Cisco Catalyst 6500 with IOS Version 12.2(17r)SX5I need real-time monitornig of failed interface, to shut it administratively down and after 5 minutes "no shutdown" it.I think is good idea to use Cisco EEM for this task.My algorithm is below:
1. EEM script is looking for event about failed interface.
2. EEM script is shutting interface down.
3. EEM script is waiting 5 minutes.
4. EEM script is enabling interface.
I know how to configure EEM for steps 1, 2 and 4, but step 3 I do not.
i want to know the definition of "Routing Delay in a network".
View 1 Replies View RelatedI am encountering delays when making any calls using VOIP. I understand that there is always a delay using VOIP but not as much. I've done a bandwidth test on my network and everything seems to be Ok, we have 4 T1s with 55 Reps using it. There is nothing choking up the network.
View 3 Replies View RelatedI've got a strange problem with my internet connection. I have recently moved and brought my desktop with me. While I am able to connect to the internet in my new place, a weird problem arises: whenever I try to access a new webpage, there is a consistent 5-10 seconds delay before the page actually loads. After the initial delay however, the webpage will load quickly. This problem will repeat itself whenever I try to access a site that is not cached. I have tried switching ethernet cables/wireless adaptars and this problem persists. I have also tried scanning and cleaning my computer yet nothing works. Speedtest.net show that my ping, d/l and upload speed are all fine.
PS: Just to add some information, my new place comes with its own existing router (the building includes internet into its rent), and I am simply plugging an ethernet cable from my computer to it. In addition, my roomates and my laptop seem to be able to access the itnernet fine with this problem. Since this sounds a lot like a DNS problem, I have also tried using OpenDNS and that doesn't work either. In addition, the delay persists regardless whether I am trying to access a website via its domain name or numerical IP address.
I have an issue with a Cisco ASA 5520. It seems to block some emails incoming from some recipients. The sender's mail server clearly reports my ASA as cause of the problem (see attached image). Unfortunately I have not the logs about that event and the time frame to close this issue is very narrow.
View 5 Replies View RelatedCore Internal Network -> Cisco ASA 5510 -> DMZ Switch.If i send a ping reguest from internal network to servers in DMZ Switch over the ASA 5510, i can see a delay in response, some times this delay can be more than 80ms, this is a problem for the web applications in http traffic.How i can find what's happening on my ASA? I disable the inspect traffic over the IPS, disable the policy maps below, reload the two boxes, but doesn't works, the problem still persists. [code]
View 2 Replies View RelatedThe wan routers are 2600 and 1700. Conversions between the two? Pros/Cons of one versus the other? Regrets or horror stories for one versus the other?
View 3 Replies View RelatedActually i have problem with my connection and i would like to find that problem. i have 3 sites(1,2,3) connected together through fiber multi mode cable. The site 1 having the control room, the maximum distance between site (1 and 3) is 1.8 Km, the other distance(1 and 2) is 1.2 km and i already used 3750X switch and GIBIC GLC-FE 100Fx with support MM cable up to 2 KM.
i have in site (2 and 3) 10 cctv 3 mega pixel cameras and i check for the bandwidth is less than 100Mbps when i connected the 2 switches(2 and 3)to the switch in the site 1 there is a delay i thought maybe because of the bandwidth so i tried to connect only 1 camera but the same problem(delay). i did not make any configuration for the switches.
i'm having some problems to configure.i have two sites, a primary site and the secundary site, in both sites every switches are layer two. I configured and activated the RSTP (802.1W) in every switch, but about every 30 minutes the topology change and happening a delay in network and loss some ping (ICMP).
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I have one problem with our windows 2008 server when any user want to log in the domain from his computer, it takes long time. it takes around 5 minutes. I have installed DNS on the same AD Domain. Is that OK ?Secondly i have around 70 users and 4 ISPs.. Each ISP is used for specific data transfer. Each of the ISP is connected via ADSL Router to our switch?
View 3 Replies View RelatedI have a wierd "2 second delay" issue with audio generation on a SRP527w.When in a call, with myself on both ends of the setup DECTphone - FXSport on SRP527w - VOIPprovider <> PSTN/GSM - Mobile I can hear my voice on the mobile immediately, as expected. However, the same words i speak (having both the DECT and the Mobile at my ears), are heared on the DECT with 2 seconds delay. Trust me when I say that this is the base for a poor rated telephone call and misunderstandings therein.
This issue is the same when calling to other mobiles and even land-lines, both in being called and being the calling party... Every time the voice from the other side is heard "delayed" on the DECT. Testing the DECT on a normal non-voip connection results in a normal conversation, as far as this is possible with me talking to myself I do have a separate CBR pvc for the voice on the SRP and to investigate the issue I've put the SIP user on a soft client, using a UBR pvc on the same SRP, both pvc's do use the same provider but diverend gateways. And with the UBR + softphone i do not have this "2sec delay" issue.
So, ruffly said this seems to locate the issue in the SIP>FXS DSP, with specific only the digital>analog decoding/generation (not with the analog>digital encoding, as i hear myself normally on the mobile, with no/normal msecs delay).
I noted that my router (Linksys3200) has delays or lag on the average of 5 to 10 seconds apart, but random, while playing on line games. While continuously monitoring delays (ping) with a program called Ping Plotter, it ranges from 25ms to 65ms. When not gaming, just surfing the net, the ping is zero and once in a great while a 5ms or 6ms spike may occur.
Am I looking at a malfunction in the router or the computer? or Is this normal?
I have a fairly new HP Proliant server that serves as a fileserver, among other things. I've tried serveral operative systems in order to find the one that suits my server-needs best and ended up with Windows 2003 Server.When browsing shares on my server over local network, there is a slight delay on approximately half a second every time I navigate. It's not a huge problem but it's enough to be annoying.However, there was no problem when I tried Debian 6 with Samba. So logic would suggest the problem is somewhere in a setting or something like that. But which setting? [code]
View 5 Replies View RelatedI have a program that is supposed to talk to a server. I basically need to see how it behaves in the worst of circumstances. I need something to mimic this kind of behavior by adding "artificial" high latency to the program. Is there an easy to use program that connects to a the adapter that can do this kind of testing?
View 1 Replies View RelatedI have 2 Servers connected to same cisco switch i3560 n same L2 VLAN, i ping from Server 1 to Server 2 i got delay 800ms?why is that?
View 4 Replies View Relatedi am facing time daely issues on cisco 2960 s series switch while booting .It is taking time for electing masrer and sleeve for stacking.can i disable the election process for stcking while booting.
View 4 Replies View RelatedI'm facing a problem with the Cisco 1522 AP at the remote site every day that it takes about 2 hours to join the WLC, is there any way to minimize the time that the mesh 1522 AP takes to join the WLC?
View 2 Replies View RelatedWe have two devices connected through a several miles DWDM connection (two switchports 10GBSR).We would like to measure the delay for that connection.
View 4 Replies View RelatedA couple of users on my network complain about timeouts. They access the same server which runs a SQL server. People from outside world can access it without a problem but internally it keeps timing out. I have also noticed that VoIP phones have a delay internally. So if i pickup my phone and dial an extension the other person can't hear me sometimes but i can hear him.
I have experienced the VoIP problem but have never had any time outs on my machine. I tried packet capture on a couple of computers but i cant see anything out of the ordinary. Alot of ARP, some STP which i think shouldn't reach the machines, dropbox traffic etc.
I have a working BGP session established. With "debug ip bgp events" I see many (2/3 every second) messages like this:
*Jul 23 11:23:48.773: BGP: default originate timer at max delay of 64 sec
*Jul 23 11:23:48.997: BGP: default originate timer at max delay of 64 sec
I can find nothing about this message. IOS version is 12.4(24)T and platform is Cisco 2811
So the delay is introduced getting data onto the wire. However say there are two hops to the destination server, each hop is via equal connectivity speeds say 1G interlinks.
Question:
Is there serialization delay FROM the wire/interface onto router/switch backplane/fabric?
Is the serialization delay from backplace/nic back onto the wire to the next hop? - Or if using a switch with equal in/output speed transmitted without serialization?
What happens with a routed interface vs switched?
Most articles discuss the latency induced between the much higher OS/NIC interface out to the wire, but not the switch/router serialization that does or doesn't occur.
We have recently purchased 2 x 4900M switches with the following configuration:
2 x X2-10GB-SR installed in port te1/1, 1/2 (optical)
1 x 20 x 1GB RJ45 installed in the top left of chasis ge2/1 - 2/20
1 x WS-X4908-10G-RJ45 8 port 1/2 card in the top right of chassis te3/1 - 3/8
We have te1/1 connecting the 2 switches, and various vlan's and connections on the 1GB RJ45's with no problems.
However, we have a number of 10Gbps BaseT connections te3/1 - te3/5 which are causing us issues. On a reload of the switch or removal / re-install of the cable it can take anywhere up to an hour for the port to become active again. So when we reload the switch, we may get a connection come up after say 3 mins, but the port next to it may not come up for 15-60 min. The cabling is all the same (CAT6 and has been tested/verified) and all connections go to Broadcom 10Gb cards in Dell 820 servers running vmware. We have the following set on the ports:
switchport mode access
spanning-tree portfast
No speed or duplex can be set on these ports - these options are not available in the config.
Once a link is finally established, it will hold the link solid with no problems, but this is a problem for us, we can't have a reboot take an undetermined amount of time for the link to come back.