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9
votes
4answers
627 views

FTTH and alternatives

I was listening to a interview regarding the back country and Fiber to the home with the Swedish professor in telecommunications Per Ödling. Once in the interview he was referring to technologies that ...
4
votes
1answer
979 views

WEP 152bit encryption key… Why?

As stated here: http://documentation.netgear.com/wag102/enu/202-10120-01/v1/WAG102-4-10.html and in many other sources, WEP key can be 64bit, 128bit (factors of 2) and 152bit length. Factor of 2 ...
7
votes
1answer
3k views

DNS Doctoring / Reply Modification on Cisco 1900 series ISR

We have a Cisco 1900 ISR and have recently setup a web-server at ourdomain.com. The site works perfectly, however from the LAN we cannot use ourdomain.com to access the site, instead everyone has to ...
6
votes
2answers
26k views

What are the different modes in Cisco routers, and why these modes?

I want to know on what basis Cisco designed the different modes in their routers. For example: config mode execution mode Can any one give the perfect reasons behind the different modes? What ...
4
votes
1answer
798 views

L2 vs L3VPN with DIA and WAAS

For an enterprise migrating from traditional Internet IPSec L2L VPNs for branch offices to a MPLS-based VPN, there are options for either a L2VPN or L3VPN. The L2VPN looks more attractive as you ...
25
votes
9answers
70k views

Reason for both a MAC and an IP address

If my computer has an IP address,why does it need a MAC address?
4
votes
3answers
8k views

How to configure PAgP or LACP on GNS3

In gns3, when i configure a router with a NM-16ESW module to use as a switch. And I can not configure PAgP or LACP on this router. It has only one mode ON, and there is no DESIRABLE or AUTO or ACTIVE ...
8
votes
2answers
9k views

Cisco ASA Routing Issue

I am working on a lab right now and am having some issues with ASA routing. Here is the current network topology: Currently if I login to the console on the ASA or Router I can get outside to the ...
5
votes
4answers
18k views

Multiple sub-nets behind a router

I have 3 simple questions:- Is is possible to have multiple subnets behind a router? I believe it is, e.g. router LAN interface would have subnet mask 255.255.0.0 and machines connecting to the ...
5
votes
1answer
2k views

Cisco Aironet Last Activity Counter seems not to work causing clients to drop frequently

My current Setup: Two SSIDs broadcasted SSID 1 (airlan) is configured with dot1X and dynamic vlan association SSID 2 (prv) with PSK and a static vlan I've recognized, that every 60s the devices on ...
7
votes
5answers
20k views

Copy running config in one line

I want to make a script to copy the running config of a switch 4506 in one line. So far, I see two option : copy run tftp: sw#copy run tftp://10.0.0.1/cfg.cfg Address or name of remote host [10....
10
votes
1answer
3k views

High-Density WiFi & 2.4GHz Co-channel Interference design

The issue: CCI (Co-channel Interference) on 2.4GHz. The Environment: 40 seats per classroom. Higher-ed, so extremely mixed client base. AP-on-a-stick set to 24Mb lowest Mandatory data rate & ...
5
votes
1answer
13k views

IOS - Nat from a VRF to WAN interface in global routing table

Trying to get my head round how best to achieve the above In essence we have s speed test server that is available in the CPE's global routing table , that we would like the customer in VRF X to test ...
4
votes
1answer
7k views

Cisco show all static route

Here is the question -> I have added a floating static route with administrative distance 200 to a router, as default, show ip route static only displays one static route with the lowest ...
5
votes
3answers
5k views

Privilege configuration on cisco switch

I have a Cisco switch who have an user configured with privilege level 3 configured as below ! the user can configure an interface privilege configure level 3 interface privilege exec level 3 ...
2
votes
1answer
5k views

QoS bandwith calculation

Please explain: I have two routers with QoS on them.. Both WAN-facing interfaces have a bandwidth command with the same value (100000) but the priority queue (also the other reservations) calculates ...
6
votes
1answer
294 views

CISCO developer routers/ firmware

I was wandering if there are any CISCO routers and firmware for purchase or download for developers so I could test my implementations on them. I am developing a firmware plugin to increase security ...
4
votes
2answers
512 views

IGMP snooping (Bridge operation)

What is Meant by RFC 4541 when it says... 4) All non-IPv4 multicast packets should continue to be flooded out to all remaining ports in the forwarding state as per normal IEEE bridging operations.
7
votes
1answer
1k views

HP Procurve 3500 with K.14 - strange MAC search issue

I have strange issue with HP ProCurve J8692A 3500yl-24G. If I display MACs on port I see it: 3500(config)# sh mac 10 | inc 5cf3fc-a53456 5cf3fc-a53456 But if I try to find where is this MAC then I ...
1
vote
0answers
643 views

UMTS Architecture and differences between releases

I am studying the evolution of mobile network technologies and trying to get a clear overview of the UMTS network achitecture. However, I found it hard to decide which release of UMTS is considered ...
5
votes
1answer
421 views

Monitor Throughput on Nokia IP560

I am planning on replacing our pair of Noka IP560s running CheckPoint. I need to size the replacement accurately so i need to see the maximum throughput the Firewall has ever had to deal with. I can ...
0
votes
2answers
9k views

Configure a Guest network on a Sonicwall TZ-205 N

I'm trying to configure a Sonicwall TZ-205 N to have 2 wireless networks. The first wireless network is a guest network which only has access to the internet (client isolation would be nice but is not ...
3
votes
1answer
1k views

How to Calculate Throughput in Gbps

After a look at an intrusion detection system, I saw the following statement : "The IDS is able to analyse 10.000 characters (from packets) in 0.17ms" and I wanted to know the throughput in Gbps. ...
8
votes
1answer
5k views

Remote sniffing with ERSPAN to the desktop

I know how to use both SPAN and RSPAN. If I'm not wrong, ERSPAN leads us to the possibility of remotely monitoring a router through an IP network and a GRE tunnel. However a tunnel end-point is needed....
9
votes
1answer
2k views

JUNIPER: Why is OSPF adjacency breaking when I enable FBF on an OSPF interface?

I've built a test lab where I am testing Filter Based Forwarding (FBF), aka Policy Based Routing. Question will follow below, but first, the details: Below is the topology diagram: OBJECTIVE: Any ...
2
votes
3answers
6k views

Can I route packets to different VLANs based on destination IP?

I have a network that consists of 3 VLANs: 1 -> Desktops and Laptops 50 -> IP Cameras 200 -> Servers Just to make this simple, treat all devices in a VLAN the same: 1 is a member of 200, as ...
6
votes
1answer
499 views

What does the RTTSum and RTTSum2 represent in a ASA SLA monitor?

I have enabled the SLA monitor on an ASA, and I was wondering what the RTTSum and RTTSum2 Metric Represents? RTT stands for "Rout Trip Time" I am having trouble figuring what the RTTSum actually ...
8
votes
3answers
574 views

Map the underlying structure of a VLAN

Is there any way to detect the underlying layout physical layout of a VLAN. For instance, to know whether two devices in the same VLAN are connected via the same wifi AP. To clarify, this would be ...
7
votes
2answers
36k views

Injecting routes in to BGP for advertisement: BGP network command

I am a complete newbie at BGP configurations.Need some clarification on understanding BGP network command. One of our MPLS site routers have the following config : (Pasting only config snippets ) " ...
3
votes
2answers
4k views

Ruckus ZoneDIrector frequently issues new IP addresses

We have a ZoneDirector 1100 appliance with 8 access points. Our software engineers are accessing the network via DHCP-provisioned IP addresses. Normally, whatever IP they land on is irrelevant to ...
11
votes
4answers
10k views

Is there an automatable way to backup the configuration from a WLC 2504 controller?

I am looking for a way to backup the controller configuration file via an automatic process. I've seen links to the web interface which appears to do a one-time tftp copy of the config to a remote ...
12
votes
3answers
21k views

Wifi TCP iperf throughput: 1 stream vs multiple streams?

In a WLAN iperf TCP throughput test, multiple parallel streams will give me higher throughput than 1 stream. I tried increasing the TCP window size, but I still cannot achieve the max throughput with ...
8
votes
1answer
2k views

Something is filling my force10 ARP table

I have 2 force10 s25 switches that are used for a dark fiber link between two school buildings. One of my switches is filling its ARP table to the brim and then failing. This can happen as often as ...
2
votes
2answers
5k views

Cisco ASA - Remote VPN - Dual ISP

I'm trying to set up a L2TP/IPSec VPN on a Windows 7 client, to a Cisco ASA 5505 SecPlus license. ASA have dual WAN connections: wan1: a mobile 3G connection behind the ISP router, used for Internet ...
14
votes
2answers
1k views

BGP regular expression .+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+

could anyone tell me what ip as-path access-list 100 deny .+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+_.+ stands for?! I searched over the internet for the meaning of this regular expression, but I was unable to ...
8
votes
2answers
3k views

JunOS FreeBSD version?

http://juniper.cluepon.net/index.php/JunOS JUNOS prior to 5.0 was based on FreeBSD 2.2.6. JUNOS between 5.0 and 7.2 (inclusive) is based on FreeBSD 4.2. JUNOS 7.3 and higher is based on FreeBSD 4.10. ...
3
votes
1answer
809 views

Destination node sequence number increment policy

I read the following from RFC 3561 - AODV, page 11: A destination node increments its own sequence number in two circumstances: - Immediately before a node originates a route discovery, it MUST ...
4
votes
2answers
4k views

AODV sequence numbers and loop prevention

I am learning about the AODV (ad-hoc on-demand distance vector) protocol. I saw a "sequence number" with a value like "A 46"; however, I don't understand why incrementing this sequence number can ...
7
votes
1answer
2k views

What is the relationship between “System version” and CUCM update versions?

I am writing code to verify that the version I retrieved from CUCM/CallManager (e.g. 7.1.5.34900-7) includes a security fix found in a particular patch/update (e.g. 7.1(5b)su6a). Given that these two ...
7
votes
2answers
2k views

“Local Policy Denied Prefixes” in 'show ip bgp neighbor' output

I've been spending the last week or so troubleshooting some (maybe related, but probably not) issues with Quagga. I have a test router - 7204VXR-NPEG2 running 12.4(24)T6 - with a single BGP session to ...
8
votes
3answers
12k views

What is the difference between VPLS vs Layer 2 VPN?

Apologies about the very open ended question, but I am struggling to differentiate between VPLS & L2 VPN's. I'm aware they both run over MPLS, but I can't find any documentation or sites that ...
6
votes
4answers
454 views

Cisco Catalyst 2960 switch does not produce 3rd PC details in ARP table

I am polling ARP tables from a Cisco Catalyst 2960 switch. The problem I encounter is that I have 3 ports into which I placed a server, a laptop and the cable from the switch. When I poll the ARP ...
13
votes
3answers
29k views

Two-factor authentication for SSLVPN (cisco)?

Just got asked today about implementing two factor authentication for users of SSLVPN within our company (connecting via Cisco AnyConnect we don't support/use WebVPN). Currently we use LDAP for ...
8
votes
3answers
4k views

Cisco WLC: Per user authentication, many Vlans, few SSIDs

We have a simple problem. We want to restrict our wireless users to certain business websites based on their username when they login. We have many kinds of wireless devices: voip phones, cell phone,...
7
votes
2answers
11k views

F5 session timeouts

Our F5 load balancers run version 10.2.4. We migrated from Cisco load balancer cards on the Catalyst 6500 and used to be able to run xterm sessions to our solaris and linux servers without the ...
10
votes
1answer
5k views

How would one route an IP network through different ISPs?

So, if I have a site that has 2 (or more) internet connections, with a routable IP subnet that I own, and one ISP goes down, how do I tell the rest of the world to send traffic addressed to my network ...
10
votes
1answer
486 views

Dynamic Crypto Map with IPv6 access list

I am trying to configure a dynamic crypto map for use on a pure IPv6 network, on Cisco 15.2M. The problem is when I try to add an ipv6 access list to the dynamic crypto map, I get an error message. ...
13
votes
3answers
15k views

Tracking down an invalid source mac address

I have inherited support of a remote site which contains a Cisco 4500 and is connected to ~2 dozen cisco access switches - primarily 2960s with a couple of 3750s and 3560s. Not all access switches ...
5
votes
3answers
2k views

Importance of encoding data to signal

We all know that there are various encoding schemes to encode data like Manchester Encoding, before sending it. But why is there a need to encode the data to a signal? Why can't we just transmit the ...
13
votes
2answers
1k views

VPLS Multihoming on Junos - FEC confusion‏

I'm going over the VPLS multihoming options on Juniper's web site. I'm not concerned with LAG and MC-LAG for the moment. As far as I'm aware: FEC128 is when you are using manual discovery of ...

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