What Are Port Numbers And Who Choose Them
Jul 27, 2011
I have a little experience in LAN management, solving basic connectivity issuesHowever, I am not strong theoretically. Particularly, when it comes to OSI reference model,I feel like I have understood the funda, but at the same time, I get lost, here and there,This is regarding the steps or processes involved, when one PC sends an email to another in a network,When I compose an email and hit enter, this is what I have understood.Each layer, starting from the application layer, passes the data and the control information to the layer below it, until the lowest layer is reached, from where, the actual transmission takes place via the physical medium.What are port numbers? How and when are port numbers chosen? Who takes the decision in choosing them?
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Nov 1, 2011
I have a remote site that is using port 4500 for within the isakmp phase of creating a IPSEC tunnel, but for some reason it is also using random port numbers constantly (in bold): [code] These are all blocked by the firewall when trying to communicate with our central router in the trusted network. The central router does not display the same symptoms, it only uses port 4500.Is there a way of preventing the remote router from using random port numbers and only allowed to use 4500??
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Apr 21, 2011
Point me in the right direction to determining what Cisco router model will fit in certain situations. I don't want someone to just tell me what I need, I want to be able to determine it for myself.I figure that some of the things that need to to be taken into account are processing power, memory, physical port needs, features available and services going through the router.
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Sep 2, 2011
I just spilled water on my companies Dell Latitude D630 and it didn't start. On the D630 I signed onto a domain. When I put the hard drive from the D630 to a Dell D620 the domain option is grayed out. The only option is to log onto locally. Is there anywhere to get the domain option back?
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Dec 29, 2012
choose the right media converter for my private LAN? My budget is very less & I found TP-Link products fits in my budget.I got confused by looking at 2 models & don't know which one to choose. TP-Link's MC220L and MC210CS. these two models are same but with different I/O Ports(connectors) for Fiber Cable connection?
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Nov 22, 2011
I am looking to purchase an ADSL wireless modem router combo which will be mainly used for net browsing, online gaming (ps3) and skype.It has been suggested by the IT tech we use that I a get dual band n wireless gigabit modem/router but my limited knowledge and the confusion created by reading multiple contracting reviews of products is sending me a bit loopy.
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Feb 16, 2013
We have software router vyatta and about 15 branches with cisco 881w and cisco 1941. All branches have 10mbs bandwidth and 3 of them have 50mbs. Link to vyatta has 100mbs bandwidth and situated in datacenter.All branches connect to vyatta via vpn site-to-site with ipsec.I want to change vyatta to cisco router or asa.
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Jul 10, 2012
I been using 1142n Autonomous several times.Now i have new requirement to setup 12 LAP 1142n, using a WLC.Can suggest what model of WLC should i choose?? About 30 users, in a cargo warehouse invironment.Now it is a good time for me to learn & play around with WLC.What else should i need in order for LAP & WLC to work??
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Mar 16, 2013
I have been having some connectivity problems and one suggested solution was to upgrade networking firmware. I did this for our router (Cisco RVS4000 v2) and it didn't work, so I moved on to the wireless access points (two WAP4410N). Before doing that, I also reset both to factory default settings - neither would respond to pressing the reset button but it seemed to work using the web interface for both.
Before I did anything to the WAP4410Ns, I noticed they were connected in B/G/N-Mixed mode to channel 6. Now the wireless network mode is stuck on Disable. I can choose B/G/N-Mixed from the dropdown list, but can't choose a channel - the dropdown list for that is empty. And if I try to choose Save after choosing B/G/N-Mixed, it reverts to Disable.
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Jan 29, 2013
I've had this dsl modem for a couple years now and have always to my knowledge been able to use it via only one ip number.i've been streaming video using webcamxp and other software/.today my modem began acting stupid by disconnecting once an hour and if I shut off pc of at all,i wind up having to manually reset the modem by unplugging it for a few seconds and then back in again.i eventually noticed that while the webcam is streaming video ,my lan connection on the pc shows the ip number i'm familiar with while my dsl modem shows one that's new(so to speak)..so I entered both ip numbers in to the webcamxp and found that the modem streams using either ip number..if I go to the what's my ipnumber site,it will display whichever number I have entered in to the webcamxp software//.is it normal for a modem to use 2 numbers as I don't believe this has occurred in my case before.i'm wondering if it has to do with the modem suddenly disconnecting now and then and too,having to reset it everytime I boot.i have att dsl ,no live landline just dead phone cord from the modem to the wall.
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Feb 27, 2013
I have a GM4019e Gateway desktop. I need to buy a somwhat inexpensive wireless adapter, but im unsure of which one will work with my computer.
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May 19, 2012
I have an EA3500. PPPoE connection. Can't seem to choose my DNS server (use Unblock-US) since the router insistently forces me to use the DNS from ISP.How can i work this around? I'm kinda tired of people asking me why i am changing the DNS. I want to change the DNS and that's final. It's a resource like any other and i want to use it.P.S: i tried most of the basic troubleshooting. I tried my old router back on and the DNS's works fine. I tried even conecting the old router re-routing the new one, and the other router manages the selected DNS's servers fine.
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Jul 12, 2012
Our LMS DCR include more then 1200 devices, ( ASR 1000, CISCO 2600, 2800 advanced ip services IOS etc. )Everything is working well except the IP SLA device table is empty.I can not choose any device from this table.How can i import/add devices to this table/database automatically ?
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Feb 4, 2013
I'm going to install a Cisco Aironet 1310g (ap mode) with external antenna in a warehouse (contain many metal surfaces), and I need to install this antennas on ceiling (distance from floor to ceiling is about 13 metres). I need to get at least 1Mbps performance. AP clients are Motorola MC9190-G mobile computers.
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Dec 14, 2011
I am trying to configure two ASA-5505 as a failover pair. Software 8.2.5 and ASDM 6.4.5.206 Using the wizard i get to step3 .. then nothing happens. Trying direct in asdm but the only interface i can choose is "--None Unnamed-"
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Jan 4, 2013
I have setup 15 x RV180W's so far for a particular client.They have requested that we add a Corporate Wireless VLAN for their laptop users (not guests) and add a Special Use WiFi VLAN for a particular mobile platform that is being deployed (in this case we need 2 separate WiFi VLANs to ensure compliance).Also, none of the VLANs can talk to eachother and they have their own subnets.I have the Wireless and VLANs setup, no problem... but I am having an issue wiht the VPN settings.I have the wired network's subnet working fine. But I do not know how to add the subnets for both Wireless VLANs to the traffic selection.The IP schemes will not allow me to just select a large subnet... here are some examples:
Wired VLAN: 10.10.x.y
Corporate WiFi VLAN: 10.15.x.y
Special WiFi VLAN: 10.18.x.y
x is the octet that defines the physical unit location (unit 1 = .23, unit 2 = .24, etc...) y is the octet the host.Since they are not in a contiguous block, I cannot just use a larger subnet mask.I can add multiple traffic selection rules to the ASA5515 at HQ, so that side of the tunnel is perfect... I just don't know how to add the three VLANs to the RV180. Is it as simple as using commas or semicolons?
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Aug 17, 2012
How to get any numbers regarding performance for acs v.5 ? I have looked through the documents but couldnt really get any idea. Especially in a WLAN environment - how many clients can use one appliance as primary without putting the primary under strong load ?
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Apr 23, 2012
I setup E4200 good. But, in Access Restrictions, there is no policy to choose from. Just Parental controls only.restore the Internet Access Policy like the good old routers?
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Nov 23, 2011
I have a ASA5508 running in 8.3(2) and without enable NAT. If I do a static network address translation for a inside address. any Implict rule in xlate?In another words, what is the forwarding rule ASA choose while there is routing exist and NAT? Do I need to setup bypassing NAT?
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May 7, 2013
I am in the process of implementing 750 Cisco Access Points acros the business. I need to make a note of the serial numbers and Mac addresses for our inventory before I get these configured and sent out to their relavent destinations. The AP's have have arrived in boxes of 10 (75 boxes). The sticker on the box with the barcode is either covered with a postage sticker, ripped, or my scanner will not scan it becaise it is too small. There is a sticker with the serial bundle which is larger and therefore scanable. Is there a way that I can scan this and get the MAC address and serial number.
I know that this is not a technical question but I don't want too spend the next 3 weeks opening 75 boxes and removing each AP individually and recording it.
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Sep 7, 2011
I want to know, if it is possible to create multiples BGP AS Numbers on a ASR1K6 Router or ASR9K6 Router.
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Jun 13, 2011
I have a monitoring rule that checks the number of connections on the firewall using the following command: show conn count
My results are always between 3,000 and 9,000.A while back, I had an issue where all 130,000 connections were being used up. I configured a service policy to limit the number of connections between any two end points.
I'm monitoring the error logs and I'm noticing that my connection limit rule is being triggered on a regular basis. I receive the following message.Per-client connection limit exceeded 20000/20000 for output packet from x.x.x.x to x.x.x.x on interface outside
I'm confused as to the difference between the connections limited by my rule and the connections shown by "show conn count". why I never see any connections higher than 9,000 using "show conn count" yet I am seeing alerts stating that the firewall has reached 20000 connections?My firewall is an ASA5510 running.
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Nov 26, 2011
I would like to block IP numbers. When I tried with one the router festively walked straight through it!
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Oct 31, 2012
i have a stack of 3750x, with minimal configuration. there are two vlans, and two vlan interfaces with IP addresses. when i ping out from this switch to another host, it picks vlan1's ip address as the source automatically. i tested this by doing two pings with extended options using each vlan's interface as the source, and got different results. how the switch decided to use the first vlan's ip address as a source.
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May 17, 2012
I was thinking, is there a way to view a report on the configured numbers within CUCM? E.g. not only extension numbers but hunt pilots and other things such as that? Rather than manually going to each page.
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Apr 29, 2012
I have bought 2 new ASA5505 with SmartNet contract. I already have my 2 SmarNet contract number. Now I want to add these 2 contracts to my TAC account, so I can have support for my 2 new products. My TAC account already have 1 SmartNet contract for another device I have.What is the procedure to add my SmartNet contract to my account?
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Apr 29, 2013
How many numbers of GRE Tunnels are supported on Cisco 3925 router?
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Apr 28, 2013
How many numbers of GRE Tunnels are supported on Cisco 3925 router?
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Apr 2, 2013
I have AT&T Uverse and VOIP. I can receive calls but when I try to call out many local numbers and 800 #'s I get a busy signal. I called AT&T and they said everything looks ok to them. Could this have anything to do with Windows firewall or modem settings?
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Jan 3, 2012
I am trying to setup a translation rule that takes any three numbers that start with a 4.. and translate it to 14.. I have tried a few ways of what I thought would work but nothing is working.
Examples of what I have tried:
rule 2 /(...)/ /1.../
rule 2 /4../ /1.../
rule 2 /4../ /11/
This is the rule that I use to delete the 1 when traffic flows out of my voip system.
rule 1 /^1(...$)/ /1/
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May 19, 2009
How to get this unit to hand out the Ip numbers in my network with dhcp but to allso assign these numbers in accordance to the mac address. I want o make sure the same computers get the same internal ip and not random ones?
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Feb 3, 2012
got a crahed 5520 this week and was showing <163>Nov 28 2011 11:34:45: %ASA-3-201013: Per-client connection limit exceeded -125/100 What the negative number tells ? i usually see same numbers like 100/100 with means the connection limited has reached.
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Jun 13, 2011
it's possible to retrieve Tengig interface serial numbers via CLI? We have a couple of them in 3750 switches, and we need them for our inventory.
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