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1500 questions
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2 answers

Cannot use 5GHz band Wi-Fi from channels 100-140

My AP operates in the 5Ghz band. There are no problems using Channel 36 to 64; however, clients can't even detect the SSID if I use Channel 100 to 140. Below is a screenshot of Netspot showing all the signals in my area. It seems like its not my…
user2562609
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How can I disable SIP on IOS 12.x

How would I disable SIP on an Cisco router running IOS 12.x?
Ryan
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4 answers

TCP port 0 reserved for what purpose?

I was asked a question my one of my teachers. What is TCP port 0 reserved for? I did a bit of searching and research found 2 reasons: For linux based system, to get the next available port from the OS that the program can use. Like asking for…
Haris
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5 answers

RSTP: Using switches in pairs to two switches?

I am trying to set up the following arrangement with 10 switches: I think it's relatively self-explanatory, but basically I have 8 different networks (in 8 separate VLANs) which are physically switched separately too (just because I can). I want to…
user8179
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RSTP vs. STP it really sounds just a big ball of semantics? what's the main difference between them?

one difference is that Rapid Spanning Tree Protocol (RSTP IEEE 802.1W) assumes the three Spanning Tree Protocol (STP) ports states Listening, Blocking, and Disabled are same (these states do not forward Ethernet frames and they do not learn MAC…
user7741
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Juniper, vlan-centric vs interface-centric. Which has prevalence?

I am new to Juniper and has a basic doubt about assigning an interface to a VLAN. I have read that JunOS admits both approaches. My question is, what method prevalence when you use both of them? I mean, I have encountered this real config in a…
KorXo
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4 answers

VLAN assignment philosophy

I have several Layer 3 switch/routers which are all connected via an OSPF routed network. Also attached to each switch are two other networks. I have to assign a VLAN to each of these networks, I figure that I can just reuse the same two VLANS on…
Raggles
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0 answers

Openswan-Sonicwall VPN tunnel

I've been trying to figure this out but all the documentation I can find seems to be very old. The feeling seems to be that once Dell acquired Sonicwall, documentation became sparse and mostly useless. Ended up here at StackExchange due to a few…
toxeia
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10
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2 answers

Why is adapter ARPing something it already knows?

I don't get why a machine on the network is asking the gateway for its MAC address when it already knows its MAC address: So here you can see the machine MAC ***80 (IP ..*.115) asks the gateway (Cisco_87), who has 10.1.10.1 ? In other words, where…
Tyler Durden
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4 answers

OSPF Election with a /30 link?

I have a few /30 subnets connecting OSPF routers over a broadcast capable link.. Should I also configure the interfaces involved in the link to ip ospf network point-to-point? Or does it matter? The only thing I can think of is to prevent the…
Jim
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5 answers

How can I speed up CLI typing in Cisco IOS using shortcuts?

I know we can use auto-completion (tab key) and abbreviated commands (such as sh ip int bri) to speed up typing. However, I'm still not satisfied with typing crypting chains such as sh ip dh sn bi | i 20.12 for show ip dhcp snooping binding |…
Stefan
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1 answer

Remote Campus Routing Design

A third party provider supplies connectivity my remote satellite campus over metro ethernet. Due to red tape the provider is required to supply a routed point-to-point connection (R2 and R3) to the satellite campus; ideally the provider would bridge…
Paul Garrett
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4 answers

Switch interface config for IP Phones

I have seen both of the following methods of switch interface configuration for supporting IP Phones. switchport access vlan switchport voice vlan switchport mode access and switchport trunk native vlan …
Mike Marotta
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3 answers

How can there be more than one MAC address on single switch port?

I am learning for the ICND1 exam through CBTNuggets video courses. In one of their videos they used a command, switchport port-security maximum This is what the cisco help says about it, To set the maximum number of secure MAC addresses on a…
Sufiyan Ghori
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4 answers

Measuring per-link latency/jitter/packet-loss

I need to measure the latency, jitter and packet-loss per link in a network, as opposed to end-to-end, e.g. like this: s1-eth0 <--> s2-eth0 (~ 20µs avg. latency, standard derivation 10µs, 57 % packet loss /last sec) s2-eth1 <--> s3-eth0 (~ 25µs avg.…
user1923488
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