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1500 questions
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5 answers

Why does the Cisco show run command not show the full version, while the show version command does?

Is there any reason why Cisco show run does not show the full version which is 16.3.7 in this example? IOSSW#show running-config | include ersion version 16.3 while show version does? IOSSW#show version ... Switch Ports Model SW…
user11392987
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1 answer

How to get ipfix working with openvswitch?

I'm trying to monitor my OpenVswitch via IPFix. But I'm banging my head against a brick wall for two days now :/ According to the ovs-vsctl manpage I need to add a new entry into the config-database, more precisely into the "ipfix"-table. That…
Christoph Haefner
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7
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2 answers

What exact does MIB represent in SNMP? How is it different from OID?

In SNMP, we represent each entity of information using object and to identify each object uniquely, we use OID (Object Identifier). Now there is another terminology - MIB. I know it stands for "Management Information Base". However, I am not able to…
Deepak
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7
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2 answers

Why Don’t Probe Requests for Specific SSIDs include BSSIDs

I'm looking at WLAN traffic captured from wireshark on monitor mode and notice that out of the 67,000 probe requests, 99.08% have the destination set to FF:FF:FF:FF:FF:FF (Broadcast). The thing is, it appears as though a substantial chunk of those…
JHAWN
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7
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3 answers

Is there a way to test TRILL in a virtual lab?

I don't have access to devices to run TRILL for testing and learning purposes, so is there a way to set-up a virtualized lab to try it ? What would be the virtualisation system, the vendor, the software, the version...
Benjamin A.
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7
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1 answer

MSTP and Rapid-PVST+

We have a medium sized network running all Juniper except for one building. This building is shared with another group, and is completely Cisco. We just trunk our VLANs up there. Our Juniper network is configured with MSTP with all VLANs belonging…
ZaZa
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7
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4 answers

Can throughput exceed the bandwidth of a network

I took an introductory course to networking this semester and I was wondering: looking at things at the layer 4 level using TCP can the throughput on the network exceed its bandwidth? According to the definition I believe throughput is defined as…
crommy
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7
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2 answers

How do routers on the backbone avoid IP address conflicts?

As the title suggests, how do ISPs, and other networks connected to the backbone ensure that their host network address isn't already in use by another backbone node, as there is no controlling device that governs them?
Jack_Hu
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7
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2 answers

Where is the traffic going?

Here is a routing puzzle: I'm working on a poorly documented network, and I'm trying to document things as I discover them. R1 is a core L3 switch. R2 is a router. The FW is a, well, firewall. On R1, I see traffic (about 1Mbps) in and out on vlan…
Ron Trunk
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7
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4 answers

Is it possible to perform a Layer 2 (MAC address) traceroute?

I understand the difference between layer2 & layer3 and MAC & IP. I understand address resolution protocol, etc. But is there any way to do a traceroute that will show Layer 2 information? For instance, I'd like to discover the MAC address of the…
voices
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7
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0 answers

Maximum number of subscribers per FPC in Juniper MX

If link with subscribers, containing about 12000 clients, goes down. One aggregated ethernet containing two links which goes to two different FPC's. All clients try to authorize on JuniperMX with the help of DHCP Discover messages. This is eoip…
Tomato
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7
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2 answers

Netflow differences between IOS 12.2 and 15.1

Has anyone upgraded their cisco routers from 12.2 to 15.1? I'm curious to know what kind of changes were made to netflow. Most specifically, I'd like to know how (if at all) the CPU utilization changed. The router in question is a 6506-E with a…
SmarterThanOli
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7
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2 answers

PPPoE with NAT configuration broken

We are trying to replace our existing router with a newly purchased Cisco router: GigabitEthernet0/0: PPPoE GigabitEthernet0/1: 192.168.2.1 The PPPoE is getting established perfectly, and I can ping the outside from inside CLI however, the clients…
Nick Cameo
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1 answer

How does the transport layer tell UDP apart from TCP?

So I'm reading Computer Networking: A top down approach (where these images are from) and I was looking at the Transport layer. A generic segment in the transport layer has a pretty simple structure: source port, destination port, some other header…
Lucas
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1 answer

Analyze Network Traffic by Autonomous System Number?

I'm looking for the way to take an estimate consumptions toward internet per Autonomous System Number which could help me to make a decision if it's necessary to establish a peering with this AS's company or not according the consumption. My…
Mamitiana Ra
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