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1answer
554 views

How to setup a management LAN on ISP Router

I am a little new to this but here is what I am hoping to achieve. I have an Adtran TA908e that I am managing as an ISP router. I am hoping to create a vLan to be able to attach it to my LAN for ...
0
votes
0answers
4 views

School internet stops working when I change my DNS [on hold]

On my laptop I have my DNS servers set to 1.1.1.1, and 1.0.0.1 (Cloudflare DNS). However, when I connect to my schools network my internet stops working completely. I am aware that they are using the ...
0
votes
0answers
8 views

How to troubleshoot SFP+ connection flapping? [on hold]

I'm trying to set up an SFP+ connection between two servers. The port keeps flapping. root@routeur:~# dmesg|tail [20266.254806] ixgbe 0000:04:00.1 eno8: NIC Link is Up 10 Gbps, Flow Control: RX/TX [...
0
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0answers
5 views

how does a program detect an ethernet switch change? [on hold]

I am trying to change an ethernet switch on a system.I configured the switch to match the network settings and The network seems to work and data is still transmitted between the other devices via the ...
0
votes
1answer
42 views

Restricting TFTP access from Host to Router using extended ACL in Cisco IOS

I am trying the below Extended ACLs to restrict TFTP but still I am able to upload files to the router using tftp. Not sure, what is wrong, can you all help? Approach 1: permit udp host <ip> ...
0
votes
0answers
10 views

BPF filter begin to end (range) [on hold]

Using tcpdump, I am capturing a tcp stream on a port and data is ASCII. I am not certain if each packet has the entire message. I know how the message begins and ends so I would like to setup a filter ...
0
votes
0answers
14 views

Network scan against host on different VLANs (Nmap) [on hold]

I need to scan some hosts located on a different VLAN using Nmap, but those machines are unreachable from the VLAN used to launch the scan, I assume that that is because a FW sited between both VLANs. ...
0
votes
0answers
6 views

how a device tell which part of a signal is noise and which part is the wanted [on hold]

1.As a device like mobile phone,it can receive so many signals,how it can tell which part of the signals is noise and which part of the signals have the information wanted? 2.when a device connects to ...
0
votes
1answer
15 views

Logical Link Control (LLC) vs Medium Access Control (MAC)

What differs the LLC sublayer from the MAC sublayer? From what I've understood - The MAC sublayer does what the PHY layer should be doing: detection (error, collision), channel listening, analog-to-...
0
votes
2answers
37 views

Which port determines the protocol?

If we have a common protocol port on both ends.. say source point is 443 and destination port is 80 (hypothetical situation, I know this combination of ports probably makes no sense).. how do we ...
0
votes
1answer
104 views

CISCO Tc Bc and CIR units

Are the units in these formulas correct? Tc (seconds) = Bc (bits) / CIR (bits per second) Tc (milliseconds) = Tc (seconds) * 1000 Bc (bits) = Tc (seconds) * CIR (bits per second) CIR (bits per second)...
0
votes
2answers
64 views

Can a router route 2 switches with multiple vlans and subnets

Good afternoon/evening, Today on my Cisco Packet Tracer, I made two layer 2 switches and 2 PCs on each switch. I created a vlan 10 on the switches. I trunked the switches together so they can see ...
0
votes
0answers
10 views

WiFi Camera connection mechanism [on hold]

I've recently been experimenting with an ezviz CTQ2C wi-fi camera. To connect this to my network, I start the ezviz app on my phone, enter the wi-fi credentials (this is just the WPA2 password) on my ...
0
votes
0answers
8 views

See real IP in another subnet [on hold]

I have a mikrotik router with NAT enabled (srcnat -> masquerade) and a DHCP with different pools on each interface. Let's say: Port 1 - WAN (1 public IP given by ISP) Port 2 - Desktop (172.16.0.0/...
0
votes
0answers
5 views

How can I add a cellular hotspot IP to a firewall? [on hold]

Pardon my ignorance, but I'm trying to connect to a server hosted in GCE for which I have a firewall set up. While connected to a WiFi router, I can add the public ip to the firewall and connect ...
0
votes
0answers
8 views

How to subnet correctly? [duplicate]

For an organization having 5 departments with less than 256 devices per department and IP address pool 172.16.0.0/16. what is the correct approach for subnetting? 1. should 4 bit be borrowed to ...
1
vote
1answer
23 views

Cisco MIB for physical memory

router#show ver 4194304K bytes of physical memory. Does anyone know the mib for physical memory of a cisco router? Lots of examples of memory used etc.
0
votes
1answer
20 views

Ubiquiti APs on manged or unmanaged switch?

I have three APs, one UAP-AC-IW and two UAP-AC-LITE. I have a Netgear Smart Managed Plus Switch, mainly for VLANs with plenty of open ports. I need to either add an unmanaged POE switch or a POE ...
0
votes
2answers
26 views

Will pinging the multicast “all hosts” IP 224.0.0.1 fill my ARP cache with all hosts on my current subnet?

Just wondering in case I ever have a want / need to see all the hosts on my subnet.
0
votes
0answers
8 views

I wasn't able to see the VLAN tag in the wireshark observed packet [on hold]

I tried to create a VLAN interface on one of my Linux laptop using the vconfig utility. I did the same thing on another computer. The VLAN interfaces were created on both machines and with the same ...
0
votes
0answers
8 views

Update of NAV in case a station recivies both RTS and CTS frame

Suppose station A receives both a RTS and a CTS frame from station B of duration D and D', respectively. Suppose that when station A receives the frame, it updates it NAV value before sending its ...
0
votes
0answers
8 views

does VPN provide port forwarding [on hold]

I want to use port forwarding on my router. However this is an "premium" feature from my ISP and thus has to be paid (public IP). My question is, if I get myself a VPN, does it allow me to perform ...
0
votes
0answers
6 views

Expected delays accessing server via IP locally via DNS locally and globally [on hold]

I would like to know the expected delays (if any) in accessing a server in the same network and via the internet. Hypothetically I am on the local network and my IP is 10.16.140.74 I access a ...
0
votes
0answers
9 views

Newly installed 10gbit Home network speed issues [on hold]

i recently upgraded my home network to 10Gbit but i dont get this speed TD:LR Two devices have 10gbit network adapters and between the two i get max 2gbit speed. My windows based laptop with wifi 5 ...
14
votes
7answers
14k views

Full-duplex with two antennas

It is said that wireless is a half-duplex medium. "Dual-band" stations are now common, with one antenna in the 2.4 GHz band, and the other in the 5GHz band. Suppose now we have stations with both ...
0
votes
0answers
5 views

Deploy Public Key in Windows Server with sftpd Client/Server [on hold]

I want to deploy a public key file in a Windows Server: I have a freeFTPd client/server version 1.0.13 but did not support the key file authorization so my question is if someone else know how to ...
0
votes
0answers
8 views

Issue with Check Point Endpoint Security and Windows 10 [on hold]

The command ping (and others) not reply from a PC on LAN to my PC. [desarrollo@centosdev ~]$ ping 192.168.1.34 PING 192.168.1.34 (192.168.1.34) 56(84) bytes of data. ... This issue resolved when ...
1
vote
2answers
3k views

HSRP change priority didn't failover

I have HSRP running on two L3 switch and i change priority to higher but it didn't failover, why? SW1 interface Vlan30 description Internal_PrivateIP ip address 10.5.0.2 255.255.248.0 no ip ...
0
votes
1answer
38 views

BGP local-as command clarification

On my network infrastructure, an Arista switch is the core switch and a pfsense server the gateway. BGP is used to advertise routes for all the internal networks. On Arista switch, I see the BGP ...
0
votes
0answers
8 views

Is there a way to use softwares which requires graphic card through windows 10 remote control? [on hold]

I recently started using windows 10 remote control to use my home pc trough a weak laptop (for when I can't bring my PC but my laptop isn't fast/strong enough). It works pretty well, but during a ...
0
votes
0answers
21 views

Why are PTO and RTO high compared to early retransmit time?

The detection and retransmission of a probably lost packet via early retransmit or RACK takes roughly 1*RTT, at least in high latency environments. In case of a tail loss, a probe Timeout (PTO) will ...
0
votes
2answers
74 views

Pinging my own pc [on hold]

Lets say that private address of my PC is 192.168.5.5 What would be the difference between ping 192.168.5.5 and ping 127.0.0.1 I know that the output in the command prompt is the same, but, ...
0
votes
0answers
11 views

How to get graphical view of jitter, packet loss etc of an RTP pcap using tshark? [on hold]

I know that wireshark GUI tool has a feature (RTP analyse), that will analyse the RTP stream and give all the details of the stream, like loss, jitter and even play the audio if possible. I want to ...
0
votes
0answers
19 views

Using external directional antennas with 802.11ac MIMO / beamforming [on hold]

I would like to add external directional antennas (Yagi or panel with ~30˚ horizontal/vertical beamwidth) to an 802.11ac router running DD-WRT. This is for an outdoor, field application where: ...
0
votes
2answers
85 views

Wake-On-Lan (WOL) from WAN does not work with Unifi (USG/Switch)

tl;dr I need WOL over the internet over the USG to work. WOL works already locally. I guess the USG/Switch is the problem. Hi all As a newcomer to networking in general and Unifi in particular I am ...
2
votes
1answer
36 views

juniper vlan-ccc vs ethernet-ccc for eompls

In juniper ethernet-ccc transports customer's vlan end to end. Does vlan-ccc also transport customer's vlan across as well? thanks.
0
votes
0answers
15 views

Port Forwarding testing [on hold]

I am working on a task where i had to disable port forwarding. For this, I turned AllowTcpForwarding and X11Forwarding to No. What i am looking to do now is to do some sort of Port Forwarding test to ...
0
votes
1answer
43 views

Is there any fixed version of CSMA/CA?

I was trying to understand exact algorithm for Carrier Sense Multiple Access / Collision Avoidance mechanism from Forouzan's book. The book gives very detail explanation of topics. However explanation ...
0
votes
0answers
23 views

How to stress a firewall with tcp connections? [on hold]

I want to test, how many concurrent tcp sessions a firewall can handle until it drops connections. My first try was with multiple hping3 sessions doing a SYN-flood against a server behind the ...
-2
votes
0answers
16 views

Host to Host communication [on hold]

Host---switch----router-----router2-----switch2----Host2 1) For the given network diagram, provide IP and MAC addresses along the path (from Host1 to Host2) where necessary (you can choose any ...
0
votes
0answers
14 views

What would be the easiest way to record/view network connections of multiple computers on a network? [on hold]

Currently, we have a few computers in a lab and what I am trying to do is set up a way that allows me to view any given computer's network all from one computer. We have about 5 laptops, hardwired, ...
0
votes
0answers
31 views

What services does the physical layer provide to the link layer? [on hold]

The physical layer is responsible for transmitting raw bits, bit-by-bit, over a physical medium. It is concerned modulation, multiplexing, transmission type (duplex), etc. But what is the minimal set ...
0
votes
0answers
16 views

Azure VPN Gateway with dynamic IPs [on hold]

I currently have several site offices connected to my head office via site-to-site VPNs. My head office is the only office with a static IP and all site offices have dynamic public IPs that change ...
0
votes
0answers
8 views

Reverse proxy to forward proxy [on hold]

I'm trying to setup a reverse proxy for a forward proxy (squid) for a specific subdomain (i.e. proxy.mydomain.com). Currently I have nginx that does reverse proxy to other http servers in my network (...
0
votes
1answer
33 views

How to extract destination MAC from PCAP? [on hold]

I have PCAPs collected at the Raspberry Pi (from this paper). I want to extract the following headers: Ether header (3) IP header (12) TCP header (10) UDP header (4) Then convert the PCAP into csv....
0
votes
0answers
16 views

What are QOS Parameters on Hot Standby Router Protocol (HSRP)? [on hold]

as the title says. I am currently labbing a Hot Standby Router Protocol on my Network. Ive configured all the devices and also tested it using Wireshark to monitor the traffic when doing the ...
1
vote
2answers
760 views

How to find a AS-SET of an asn?

How can we find the as-set of asn? For Example I have the asn:32934. I want the as-set?
0
votes
0answers
18 views

How do I connect the virtual gns3 topology to real-world devices? [on hold]

How can I communicate with virtual gns3 hostum in real world devices using python? Now my local computer and my virtual gns3 topology pingleyebiliyor each other side of the communication I did this by ...
0
votes
1answer
24 views

Uses of Rollover Cable

Whilst looking into rollover cabling, I stumbled across this page - https://www.computercablestore.com/straight-through-crossover-and-rollover-wiring - which claims that: Rollover cables are not ...
2
votes
1answer
28 views

Function of the P-bit flag in an IPv6 multicast

Currently I'm trying to learn (common) things about IPv6 and started with the address format and the address scopes. Finally I reached the multicast part where my problem with the definiton of the ...

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