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1500 questions
6
votes
2 answers

Building a 3 port network tap (100mbps half-duplex)

I've tried building a network tap with only three ports: the two communicating parties and a tap side. I knew this would force the communicating sides to use at most half-duplex 100mbps, but detection is not an issue (I'm tapping my own hardware to…
Luc
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6
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2 answers

Cisco NTP server does not respond to queries

I have an NTP configured through out our in a hierarchy. 100% reliable with regards to providing time for Cisco devices. At one of our sites we allow cameras, servers, and workstations to utilize our Catalyst 4500s as their time source. Access layer…
henklu
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6
votes
3 answers

How to find the client who downloads a big file?

today I found out that somebody in our organization utilized our uplink for 100%. We have Cisco WLC 2500 where I could see in application monitoring that 80% traffic of the last 90 sec was a file hosting service traffic. So, somebody had been…
dtsn
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6
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1 answer

BGP, multipathing, and possibly OSPF

I'm setting up a second site for redundancy and DR. The goals are as follows: ISP fault-tolerance from either site: HostA, for example, can reach the internet in the event that ISP-A(primary) and ISP-B go down. Similarly, servers will continue to…
mwood
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6
votes
1 answer

Cisco NX-OS 9K - LDAP Configuration

I'm having some trouble configuring LDAP authentication (via Windows AD) when connecting via ssh on our CISCO. I replaced some information from the switch, you will see it in uppercase here. Currently we only have one shared user, and the goal is to…
alcazaro
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6
votes
2 answers

Can a single subnet work across several switches?

New to networking and studying hard but limited access to a kit to try things at the moment... My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on the same subnet e.g. 192.168.10.0/24, on either…
ICSOTSecurityEngineer
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6
votes
3 answers

Does NAT violate end to end argument?

Does NAT violate end to end argument? What does end to end argument means in this context?
Rumesh Madhusanka
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6
votes
3 answers

CIDR and VLSM what are the differences?

CIDR improves the allocation of IP addresses. VLSM allows to define a subnet as we wish. Can CIDR used without using VLSM?
Rumesh Madhusanka
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6
votes
3 answers

Is an ONT a modem?

I was helping a friend set up a simple home network after a move recently. He referred to his ONT as a modem, and I was tempted to say "well, actually, that's not a modem..." I didn't, because I realize that from a non-technical perspective, "modem"…
Cody
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6
votes
2 answers

Juniper SRX240 Clustering - Policy out of sync

I have two Juniper SRX240's in a cluster. After re-ordering some security policies on the primary device and committing them ok I now can not make any other changes without the warning error: Policy is out of sync between RE and PFE…
Gareth Hastings
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6
votes
2 answers

Show connected (up) interfaces on cisco devices

Is there any way to show a total count of interfaces that are in status "up" on a cisco router? The purpose is to let a script go through all routers and show a summarization count of "up" interfaces.
Bulki
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6
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1 answer

Why do IXPs need ASN?

Does anybody know why an IXP needs to have an ASN? Will that ASN appear in the AS-PATHs or will it be transparent?
konstantinosAR
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6
votes
2 answers

MPLS can reroute, but can it route?

I have 4 Cisco routers, connected one to another like the following: **R1**(s1/0)--(s1/0)**R2**(s1/1)--(s1/0)**R3**(s1/1)--(s1/0)**R4** All of them have an IP address assigned on their interfaces. There is a route between R1 and R2, and a route…
Vulpo
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6
votes
2 answers

Traffic from route-map to crypto-map

This is sort of an offshoot of my previous question Ipsec vpn, phase 2 unable to come up. The VPN is up and working but now I'm having an issue with getting the right traffic across it. The only thing I want to go across it is port 80 traffic. I…
TheEditor
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6
votes
1 answer

How to use an optical tap? Which fiber should I use?

We have an optical tap (https://www.fs.com/products/73675.html) that provides an LC connector providing two TX instead of RX/TX. As you can see, there is a conflict. What I think I need: A splitter from one LC connector RX/TX to two LC connectors…
None
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