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1500 questions
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1 answer

What is "interarrival jitter" in mtr?

What is "interarrival jitter"? I've noticed it's available in mtr, but the calculated values don't make that much sense — they seem to be much larger than even the max jitter value. What would they be of use for? Cns# mtr --report{,-cycles=100}…
cnst
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Help with basic network security issue

I recently took over managing my church's IT resources. Previously it was managed by nobody and so was subject to any random person or vendor's half-baked idea for building out the network. Right now we have a wired network and a wireless network on…
Ant
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Junos: Policy-Statment and AS-Prepends

I am trying to create a policy-statement to prepend the local AS number 5 times (assuming it is AS1234) before advertising local routes up to a new upstream transit provider (no inbound traffic is desired via this upstream). MED and communities are…
jwbensley
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IPv6 replacement for ICMP timestamp

Does any standard IPv6 protocol has anything analogous to an ICMP timestamp message?
cnst
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Network Ten LTE Hubs Into One Network

I'm working through a tricky situation getting a field office set up out in a very rural area. There are ten 12' x 60' trailers being set up (2-3 metres apart from one another), each with varying amounts of staff working during the day (40-50 people…
Markus
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4 answers

Packet Collison Avoidance

If a wireless network has collision avoidance, how comes the network slows down if more clients connect to it?
LtMuffin
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1 answer

Cisco ASA: which side is "inside" with same security-level?

I have an issue with an FWSM apparently killing RDP sessions after a random amount of time, and the log entry looks like: Teardown TCP connection 145379776990678860 for MS_LZ1:10.30.3.150/49924 to LZ1_MS:10.254.0.217/3389 duration 0:01:58 bytes…
AnotherHowie
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Max AS path to accept from peer?

I heard that once AS receives a BGP update that is longer than 50, it will be dropped. Is this true or just happens with some ISPs specifying that policy? I cannot find any evidence or official documents regarding this. It's great if anyone can…
Muoi Tran
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End-to-End delay

I’m working through questions from computer networking top down approach and was hoping to get some clarity on the end-to-end delay calculation. At this stage we are not considering processing, transmission or propagation delay. N = link L = packet…
dcrearer
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How to use tcp-udp objects in a single ACL?

I have a service object group of type 'tcp-udp'. When creating an ACL based around this, I don't have the option of type 'tcp-udp'. I'm trying to figure out what the point of tcp-udp groups are, if at the end of the day you still have to make two…
A L
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VRFs to address asymmetric routing with stateful inspection

For branch offices with dual routers and WAN connections asymmetric routing causes issues with stateful packet inspection. Packets leaving through one router and returning through the other are dropped as the return router's stateful firewall knows…
Stephen Craven
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Does Ethernet still use CSMA/CD?

So considering that CSMA/CD is for detecting collisions, mostly in a bus scenario with a lot of stations, then is CSMA/CD still used? Because right now most of the connections are point to point (for example one router getting connected to another…
John P
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If there's no response to the ARP request, will the host send to its default gateway?

Host A and B are on the same subnet. A sends ARP request(s) asking for B's MAC. For whatever reason, B doesn't respond. Will A either: Give up -- it can't reach B Send the packet to the default gateway, router R, and let it try to route it to…
SRobertJames
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Cisco Router (ISR4221) Throughput - Why so slow?

I'm looking for a new router for a new branch of hour company. I got experience with cisco L2 & L3 Switches but not that much with Routers. I was looking at the ISR4000 series, specifically the ISR4221. In the datasheet it's stated that the…
Geo
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5 answers

Does a Layer 3 switch become a Layer 4 device when telnetting?

In order to Telnet to a switch (Layer 2) we create an SVI, thus a layer 3 point of contact is made. The switch inspects each packet sent from the remote client and responds to it so that it gets configured. In that case is it true that the switch…
Peter
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