All Questions

0
votes
2answers
72 views

Why my simple standard ACL outbound doesn't block the gateway's traffic/ping of the VLAN's SVI?

I am using a router/switch Cisco C1111-8p with IOS XE 16.8. I have 3 VLANs: 1: native/management 20: dev 50: Guests I'd like to block Guests/VLAN50 to communicate with anybody else but Internet. ...
0
votes
0answers
9 views

Get last logged on Windows-User without administrative access [on hold]

I don't know if this question belongs in this section but I could not find a community where it could have fit better. we're currently working on a mixed list of ip addresses and / or hostnames. ...
0
votes
2answers
29 views

Delay, Packet length and transmission rate

Why does the delay in sending a packet from source to destination doesn't depend upon the transmission rate and the packet length? If we look at the delay formula then it is, L/R + D/V.
0
votes
2answers
43 views

Assigning static IP addresses to dialin PPP users on Cisco IOS

I have a Cisco router running IOS 15.3 serving as a dial-in PPP endpoint for a handful of modems. I am using local authentication and a local IP pool to hand out dynamic IP addresses to the callers; ...
-1
votes
0answers
14 views

Same Vlan Name / ID on different switches network subnet same or different? [on hold]

Hi I am unsure if I could use the same vlan name / id on two different switches (which are located on the same floor and some in different floors) and have both vlans on the same network subnet? Will ...
0
votes
0answers
27 views

Capturing Wireless Network Packets

See below link that I was unable to comment. Sorry for the dupe but I have tried hard to get a satisfactory answer to this question. Upon reading the WS docs and others, I am led to believe that I can ...
2
votes
0answers
32 views

Meraki in Passthrough mode behind ASA

I am having trouble getting bidirectional traffic through a Meraki box behind a ASA 5508-X. I can see requests from the client VPN going from a client device to a server on our LAN, the server ...
7
votes
1answer
1k views

Raw API data for Cisco Meraki CMX Dashboard

Has anyone worked with Meraki's CMX raw data feed and can help answer some questions? I came here to ask because I have found no conversations about Meraki's CMX API elsewhere and I imagined that ...
0
votes
0answers
4 views

Combine link sharing and connection failure detection with TL-R470+ router [on hold]

I've got a TL-R470+ load sharing router, which is connected upstream to two modem/routers which in turn connect to DSL lines. I want to load share across both upstream connections. The load sharing ...
0
votes
0answers
6 views

Mobile router with firewall or website blocking options [on hold]

Looking for a mobile/WiFi router that can block access to certain IPs or websites. Any suggestions?
0
votes
0answers
23 views

Juniper SRX answers all ping requests instead of forwarding

I have about 4 different subnetworks at my place, when i'm trying to ping to static device in subnetwork1 from subnetwork2 i always see that device pings, even if it's off. I assume my SRX300 answers ...
1
vote
0answers
29 views

Why do I observe a 4-way TCP handshake instead of an expected 3-way when establishing a connection? [duplicate]

I'm doing a simple HTTP GET query on a localhost from curl to a local webserver. After I did a tcpdump I noticed these packets to be sent each time a request is done: 11:11:27.537300 IP 127.0.0.1....
0
votes
0answers
23 views

organisation with administrative network can't reach our website [on hold]

I have hosted wordpress web site for my client. The site is hosted on cloudways, the DNS is managed through telnet. The site works fine except for one organisation that works with an own ...
0
votes
0answers
15 views

Why are large networks unable to rely solely on the use of physical addressing? [duplicate]

First of all, I would just like to point out just how new I am to the subject of computer networking. Therefore, I apologise if my question seems a poor one however I am currently unable to find an ...
0
votes
0answers
14 views

Phone cable categories [on hold]

I need to change the phone wires of my house because their are very old and broken. I know about network cables but I want to know which phone category is recommended for the interior of my house. I ...
1
vote
1answer
17 views

pfsense DHCP lease remember time settings?

pfSense remembers DHCP leases for a quite long time, which is good use on a LAN where the same machines request IP numbers frequently and have a chance to always get the same leases. However on an ...
0
votes
1answer
29 views

How cellular networks gets internet? [on hold]

Mobiles get internet but how? From the towers, we used to get signals and communicate with others like calling or a message but coming to the internet how in the terms of networking terms like radio ...
0
votes
0answers
13 views

Allow outside access to program while firewall is on [on hold]

I have a pc that has a system that somehow I wanted to launch on the internet. To do this, I added a public ip to the pc. Then in my hosting, I adjusted the subdomain to reflect the IP Address of the ...
0
votes
0answers
14 views

IS-IS as a PE-CE routing protocol

In case of IS-IS as a PE-CE routing protocol for MPLS VPNs , when route is redistributed from BGP to IS-IS , does 'Down Bit' is also set to avoid routing loops?. Background Information We know that ...
0
votes
0answers
22 views

Site not accessible through public IP from intranet [on hold]

I'm hosting some sites/services like Jenkins on a server I've got at home. I'd like to have them accessible from the Internet as well as intranet through a public domain name. For this I've registered ...
-2
votes
2answers
49 views

is it ideal for a network that abandon the use of L2 switch?

I'm thinking about minimizing network hardware while optimizing network topology for company. If a company has unlimited(or very high) budget to build an ideal network for internal use(traditional ...
0
votes
0answers
15 views

openVPN client connects to VPN server from Android app but not from Ubuntu or iOS app [on hold]

Disclaimer: I am posting with full knowledge that the school owns the network and has every right to restrict traffic as they wish. My rpi3 is running an openVPN server configured using PiVPN and it'...
1
vote
1answer
30 views

Is this computer a threat? On same network range, but in a workgroup

We have a normal on-premise Class C network with an internal IP address scheme of 192.168.15.x (hypothetical). We have a SonicWALL device that acts as a VPN server for external clients, a DHCP server ...
4
votes
1answer
63 views

How to get/read NTP/SNMP configuration in Cisco ACI using API request?

I've been reading about Cisco APIC REST API User Guide - https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/api/rest/b_APIC_RESTful_API_User_Guide/performing_common_tasks.html ...
11
votes
6answers
3k views

Network latencies between opposite ends of the Earth

This is just out of curiosity. I'm currently in South-east asia, and when I pinged domains such as bbc.co.uk and google.com (in California), I get latencies of around 5ms as below: 64 bytes from 151....
0
votes
0answers
19 views

Confused in the concept of subnetting [duplicate]

I am doing sub netting and want to confirm that if my method is correct or not. Suppose we are to design a network that has 2 departments. Department 1 has 32 number of hosts and department 2 has 64 ...
0
votes
0answers
12 views

Subnetting related questions [on hold]

Coming up next week i have an examination on Networks.Having said that,crossing past papers i came upon this exercise(Picture).Most of the questions iv solved do not have this format so im kinda ...
0
votes
0answers
17 views

MPLS monitoring [on hold]

the question is that there is a network using Cisco, HPE, Mikrotik devices with MPLS L3VPN backbone (OSPF, LDP, MBGP). I can not understand how to monitor LSP paths, as well as client VPNs (to ...
0
votes
1answer
35 views

Cisco nexus 9396PX TX output discard on 40G interface without link congestion

We have cisco nexus 9396PX with N9K-M12PQ module (12x40G Interface), We have 8x10G L3 LACP bonded connectivity with our ISP and so far so good no issue at all. but recently we migrated that LACP LAg ...
0
votes
4answers
120 views

Why do Vlans need routers to communicate?

Why do devices on two separate VLANs (Virtual LANs) implemented on the same switch require a router to communicate?
5
votes
4answers
5k views

Does a router have multiple nics?

I am currently doing an internship and I hear the IT Director referring to a router port as a NIC. I can't remember exactly what he said. Also, in my Networking+ book it states that each dynamic ...
2
votes
2answers
44k views

dont fragment bit PING TOOL

Actually my machine wwan0 MTU is 1500 ashokkrishna@ashokkrishna-Lenovo-B560:~$ ping -s 1490 example.com PING example.com (93.184.216.119) 1490(1518) bytes of data. 1498 bytes from 93.184.216.119: ...
0
votes
0answers
16 views

why the DOWNLOAD speed is 124 mbps, but the upload only 19.83 mbps? [on hold]

I have a server in Los Angeles, when I use speedtest for testing the network speed. you see the DOWNLOAD is 124.07 Mbps, the UPLOAD is 19.83 Mbps. so, I have two questions: 1. the DOWNLOAD is Server ...
6
votes
1answer
1k views

Cisco 3750X Power Cable

I received a Cisco 3750X the other day. I went to go plug it in for testing and found that the standard three prong female power connector is no longer compatible with the power supply. Cisco has ...
0
votes
0answers
14 views

Shadowsocks speed vs VPN speed [on hold]

I've been looking at Outline and the underlying technology, ShadowSocks From what I understand, ShadowSocks is a Socks5 proxy with encryption built in. Usually VPNs tend to be slower than Socks ...
0
votes
1answer
89 views

Switch cannot ping server

My switch won't ping my server. Both are directly connected with each other, and are in vlan 666. When I initiate a ping from my switch to my server, the switch sends ARP requests. Then the server ...
1
vote
1answer
854 views

Sonicwall TZ105 Site to Site VPN Created can ping gateways but can't ping network from other site

Need help here Site B TZ105 x0 Lan 192.168.162.1 X1 WAN 64.x.x.x X2 LAN 10.0.3.1 Site A TZ300 X0 LAN 10.0.1.1 X1 WAN 69.x.x.x VPN tunnel set up as VPN SITE TO SITE and is Green From Site A I can ...
0
votes
3answers
30 views

What's the technology of bind MAC address with IP address, for solving iP conflict issue?

What's the technology of bind MAC address with IP address? I have a problem with the LAN, such as in my LAN, there are 192.168.100.0/24, gateway is 192.168.100.254/24. user A's IP is 192.168.100.1/...
1
vote
3answers
1k views

Juniper EX how to clear route forwarding table?

After layer 3 routing a large IPv6 assignment on an EX Juniper switch, the route forwarding table filled up and some entries corrupted or became otherwise invalid. We want to clear the whole table. ...
0
votes
2answers
33 views

Connection between two networks with different IPs and identical subnets?

How can we establish communication between two networks with different IPs but same Subnets? Network Connection 1: (Factory Network for machinery) I.P = 192.168.19.X S.N = 255.255.255.0 G.W = 0.0.0.0 ...
5
votes
6answers
3k views

Why do I need to specify a subnet mask on interface?

When assigning an IP address to an interface, why do I need to specify a subnet mask? I understand the purpose of subnet masks in a routing table for example (to specify a range of IP addresses as ...
0
votes
0answers
28 views

Default gateway query/Confusion [on hold]

I have VMware workstation 15.X and set up the following networks set up via the network editor: VMware workstations on a Vmware Network (Vmnet). The ip subnet of 10.3.3.0. VMware workstations on a ...
0
votes
1answer
28 views

Multi Area OSPF configuration in cisco packet tracer

I am a bit confuse in the concept of multi area ospf. I posted 2 days ago. And I was asked to leave the one interfaces of each router out of the circle. Now the center circle is area 0. The top circle ...
0
votes
0answers
17 views

How do I calculate the likelihood of a network partition if nodes connect randomly? [on hold]

In a decentralized network, if each node connects to N random nodes, there is some likelihood that this will create multiple networks rather than a single network graph. How do I calculate that ...
0
votes
1answer
141 views

How ARIN IP Address is used in APNIC Region? [closed]

Amazon AWS provides the following JSON (Source) which has list of IP Address ranges used by AWS. { "ip_prefix": "54.179.0.0/16", "region": "ap-southeast-1", "service": "EC2" ...
0
votes
0answers
12 views

Benefits of encapsulation? [on hold]

Some benefits for encapsulation can include: data can share network links since chunk of data is identified individually, data can be flexibily routed over different routes, encapsulation allows ...
0
votes
0answers
7 views

Hook second router to internet wirelessly? [on hold]

I have a router hooked up to a modem, and I have another router. What I want to do, is have the router broadcast a completely different network than my other router, but still have my second router ...
1
vote
1answer
246 views

TCP Three Way Handshake?

I have the following query about the tcp handshake. To establish a connection the server must send a packet with SYN flag to 1 Then the server replies with a SYN,ACK flag to 1 , and afterwards the ...
0
votes
0answers
9 views

How can I add a storage device to my router? [on hold]

How can I add a storage device such as pendrive to my router , which can be accessed by all device connected to the lan network (router) ?? NB : low cost is a must 😁 TIA
1
vote
2answers
917 views

RJ45 Cable only has 4 wires

The cable that connects to my rj45 only has 4 cables, blue, orange, blue stripe, orange stripe. When I connect them to their corresponding ports, there is no internet connection.(Blue = 4, Orange = 6, ...

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