All Questions

Filter by
Sorted by
Tagged with
0
votes
0answers
10 views

Are network IP addresses ever used as source or destination IPs? [duplicate]

The first IP address of an IP subnet is the network address, which stands for the whole network, while the last address is the broadcast address. As far as I understand, we never really send packets ...
0
votes
0answers
8 views

How are nameservers selected by hosts? [closed]

When I access my gateway's web interface, there are two sections for primary and secondary DNS servers. It is my understanding that these were selected by (and probably belong to) my ISP. My question ...
0
votes
0answers
12 views

About accept() function [closed]

When we call the function of accept, accept function will be blocked until getting the request from a user. My question is that how accept() is works? how OS wait until getting a request? Two ...
0
votes
2answers
33 views

Clarification on when routers encapsulate and decapsulate packets

I'm an application developer working on getting a working knowledge of network engineering, so basically a newbie. I've been trying to figure out exactly when routers decapsulate frames into packets ...
0
votes
1answer
16 views

How to combine ethernet & wlan [closed]

I've an ethernet connection (8Mbps), and I'm using a mobile hotspot (1Mbps Wifi). On my laptop (Thinkpad - windows 10) I've connected ethernet & connected to mobile hotspot as well. My laptop ...
0
votes
0answers
14 views

ISP Script Injection through VPN [closed]

I'm using Sophos SSL VPN Client. But I'm using BSNL ISP. Whenever I connect my VPN and browse any HTTP non-secured websites ADS gets injected to the JS script file. But when I disconnect an VPN and ...
0
votes
0answers
9 views

Hub and spoke IPSec in pfsense

I have 9 different sites and one HQ site where all 9 remote sites connect to via IPSec VPN. All are pfsense firewalls. I want to allow traffic between site 2, 3 and 4. But I do not want to configure ...
-1
votes
1answer
15 views

How does one access the Cisco Nexus 5000 terminal?

How does one access the Cisco Nexus 5000 terminal? There is a console port on the back and connecting directly to it does nothing; does it require a supervisor module or something?
0
votes
0answers
18 views

Understanding TCP congestion control

Why is the congestion avoidance here [6,14] and [18,25]. Why not [6-10] and [18-22]? Other examples I have seen online suggest otherwise: For example here: https://www.researchgate.net/figure/TCP-...
0
votes
0answers
10 views

Cisco erase nvram or erase startup-config doesn't work

According to this article, I can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: and reload command. https://www.oreilly.com/...
0
votes
0answers
4 views

How do I configure an ER-X to prioritize certain machines and services? [closed]

I have an ER-X (running v2.0.8) that is load-balancing two 16/1 DSL lines. I also have a lot of kids and Apple devices! I'm constantly getting ping spikes and other symptoms of buffer bloat and lag....
0
votes
0answers
9 views

how does routing work with LANs connected on WAN links? [closed]

Confused as to how the addressing is going to work with the routers, I've subnetted the network and everything, now my question is does each router have a network address of 10.1.0.0? and only ...
0
votes
0answers
10 views

Solution to get a cable connection without passing cables throw the wall [closed]

I have a fiber link comming to my apartment, connecting to the "fiber reader" (i didnt really know the name of that) and connecting to a wifi router. Problem is, my laptop had a crap wifi receiver, ...
0
votes
0answers
6 views

ECHOLIFE HG8245c not resetting nor i can access 192.168.1.0 [closed]

i have GPON router mode number EchoLie hg8245C It was working fine untill i uncheck the option ofenable SSID now neither the wifi is no nor i can access the router via lan cable i.e it is not taking ...
0
votes
1answer
24 views

Is there a difference between SYN-ACK and SEQ-ACK?

I've been trying to understand if there's a difference between the two, if any. Wireshark mentions SEQ-ACK under their TCP information of a packet, but I've typically heard this referred to as SYN-ACK....
0
votes
0answers
9 views

Mac using wrong route for first IP of range only? [closed]

I've got the following route configured on my Macbook: 204.141.28/22 192.168.1.1 UGSc en0 But when I check some sample addresses in that route, it appears the first IP address ...
0
votes
0answers
11 views

ssh server doesn't respond on default port (22), but works on custom port [closed]

I'm running a Ubuntu 16 based distro on a device, and get no response to ssh requests on port 22 (I am sniffing with tcpdump on the device, and can see the ssh request coming in, but nothing is sent ...
0
votes
0answers
13 views

How should I set up a network in an old mutliple floor building? [closed]

I recently moved into an old house. Were the internet is suboptimal. Right now it looks something like this: The Coaxial cable from the provider goes into the Provider Router in the basement. Then ...
1
vote
2answers
57 views

How to choose the most recommended Junos release for MX router

How to choose the most recommended Junos release for MX router? I need to choose a Junos OS release to update my Juniper MX960 routers from release 18.1R3, but I cannot find a procedure or best ...
0
votes
0answers
22 views

Juniper MX Routing Engine Firewall Filter

I'm having difficulties with something I initially thought would be rather simple. I need to apply an outbound firewall filter on an MX10003's management interface. I'm currently using Lo0.0 as the ...
0
votes
1answer
19 views

Will DHCPRequest get ignored by other computers?

I've been reading about DHCP and see that it uses limited broadcast to send its initial request to reach a DHCP server. I read about limited broadcast too which says it sends the message to every ...
0
votes
0answers
29 views

Cisco Time-Domain Reflectometer (TDR) returns cable length of 65535 meters?

Something very strange here. Today I noticed a device was unreachable. Giving a look at the switch it connects to (Cisco 3750), the port was in err-disabled due to link-flap: #sh int g1/0/15 status ...
0
votes
0answers
9 views

Router/server loses connectivity for no reason while other devices don't [closed]

I'm running OPNsense 20.1 on normal consumer hardware to manage a company LAN. I've been doing it for about 2 years, without issues. My setup is like this: ISP provides me with a modem/router An ...
0
votes
1answer
30 views

Cisco IOS Sanitization: Any Way to Not Use NVRAM?

We want a method to sanitize Cisco IOS 15 routers (ISR Gen 2) before they are removed from the facility. While a "write erase" works perfectly if the router is breathing, how to sanitize dead routers ...
0
votes
0answers
11 views

Can't connect VM's brouser to Internet in GNS3 [closed]

I have a problem with connection Windows VM to internet in GNS3 I've configured nat and dhcp on cisco router. VM can ping 8.8.8.8, but can't "ping google.com". Dns on router is enabled, and router ...
0
votes
0answers
11 views

TCP Naive Question regarding client and server sending request and replies [closed]

I am debugging and application between server and client that talks through TCP, without having a great knowledge on the subject. The servers seems to reset quite often the connection and I don't ...
0
votes
2answers
19 views

Fiber dBm transceiver power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...
0
votes
0answers
12 views

How to automate logging into a router from a gateway switch and running commands inside the router [closed]

I work in an environment where i have to log into multiple routers and get basic bgp , interface details etc. Unfortunately these routers are only accessible via logging into a gateway switch and then ...
0
votes
0answers
12 views

Does UDP hole work if server is on the same subnet? [closed]

I am trying to get a minimal NAT hole punch example working. I think the problem is that the Server and one of the clients are on the same subnet. For that client I only see some local ip from the ...
0
votes
2answers
32 views

network slowness troubleshoot

I want some suggestion regarding our network issue: From our office location to our DC ==> it's ~270msc(office and DC lies in different countries). As, you can already see here latency is the major ...
0
votes
0answers
25 views

VPN - help to building VPN networks [closed]

I am at the stage of designing a VPN network. Unfortunately, I have no experience in this type of installation, which is why I would like someone to help me, or at least direct me. I am currently ...
0
votes
1answer
30 views

Best Practices with good Home Router and Business Switch. And comparison [closed]

experts I want to make things clear as my networking knowledge is very limited. I have a quad-core home router, TP-Link C4000. And I also have Cisco SG350 layer 3 managed switch, a business class ...
0
votes
0answers
12 views

Pc components, including router. Which component stores information [closed]

This just for personal interests, let's assume I want to investigate a case as a police officer. I wonder from a technical perspective which Pc components save memory. (Including the router) Using ...
1
vote
1answer
36 views

Why isn't iBGP peer announcing external route it learned to its only peer?

I'm using VyOS to create a BGP lab. It has 6 routers, each in an iBGP pair, and 3 autonomous systems. Routers 1 & 2 - AS1111 Routers 3 & 4 - AS2222 Routers 5 & 6 - AS3333 All routers are ...
0
votes
1answer
35 views

Issue w/ Cisco router and failed NAT and static default route

I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
0
votes
0answers
12 views

How to route traffic through 2 proxies on localhost with iptables? [closed]

Trying to have the following scenario: (everything is running on the same machine) Client container (172.19.0.2) <-> proxy1 (running on localhost:4000) <-> proxy2 (running on localhost:...
0
votes
0answers
7 views

layer 3 MPLS and Internet link up and down freequently in cisco 1941 [closed]

I have my CISCO 1941 series Router, i create two sub-interfaces which passing internet and MPLS traffics respectively, but recently days i experience a certain scenario where by either of the ...
0
votes
0answers
8 views

Use MX records to forward all mail to specific server [closed]

I have two domains, lets call them example.com and example.de I need to have all emails sent to an (any) example.de address being forwarded to the example.com email server. Is it enough to place an ...
-1
votes
0answers
10 views

share mobile data from client to lan [closed]

can help me ? how to configure AP ?
1
vote
2answers
65 views

How Does Network Address Translation Work Initially at the End Point Router

I have come across a question that I can not seem to get a quality answer to. I understand how NAT works when a reply packet is received and how it is mapped back to an internal IP address from the ...
0
votes
0answers
15 views

How can IoT devices be remotely accessible despite not having any open ports on the router? [closed]

I know the methods used for this won't be exclusive to IoT devices, but my post is about them because they make things a little less abstract. So to my understanding there's two methods that are used ...
0
votes
1answer
14 views

Cisco APIC routing protocol status via CLI?

ACI Path Tenants > Networking > External Routed Networks > In the area with the routing protocol check boxes, there are a few options such as BGP, OSPF, and EIGRP. In this image, BGP and ...
0
votes
1answer
16 views

Cisco APIC AAA TACACS+ Management via CLI?

In APIC, the implementation of AAA can be seen in the following path: APIC > ADMIN > AAA > RADIUS Management > RADIUS Providers APIC > ADMIN > AAA > TACACS+ Management > ...
0
votes
0answers
15 views

Multiple TCP dup ACK with spurious retransmission [closed]

I have a cellular IoT-device connected to a MQTT broker with a keep alive of 15 sec. It happens once a day that the device gets disconnected from the server (server log shows: client stopped due to ...
0
votes
1answer
7 views

Connect via PoE an access point D-Link DAP-2610 using PoE out port of a Mikrotik Hex S [closed]

I have just bought an access point D-Link DAP-2610 and it does not come with a power supply so I want to power it via PoE using eth5 of my Mikrotik Hex S. When I plug in my device, RouterOS in Winbox ...
0
votes
0answers
14 views

Connecting a router with 2 GBit ethernet cables to a switch [closed]

I have a FRITZ!Box 7490 that has 4 gigabit LAN ports. Since I have a lot more devices than that I'd like to connect them to a 16 port switch and connect that switch to to the FRITZ!Box. Since I also ...
0
votes
1answer
15 views

FortiOS 5.2.11 SSLVPN Split Tunneling route FQDN [closed]

Is there anyone who has the experience to configure FortiGate SSL VPN split-tunneling to route FQDN object? What I am trying to do is we need to access some websites that can only use our office WAN ...
0
votes
1answer
15 views

Cisco APIC Management Access Policy via CLI?

In APIC, the status (enabled/disabled) of HTTP, HTTPS, SSH, and Telnet state can be viewed in the following path: APIC > Fabric > Fabric Policies > Pod Policies > Policies > Management ...
0
votes
0answers
8 views

how bandwidth can be effectively allocated to a user using ieee 802.11 standard? [closed]

In wireless networks resource allocation is a significant issue which has caught the interest of researchers. Bandwidth is one of the vital resources in any wireless networks. Consider a case of ...
0
votes
1answer
23 views

Why there is a statement of FIN packet is easy to discard in the networking?

In Nmap port scan there is a Covert scanning which use FIN for scanning, but it is not accurate, because the FIN packet easy be discard in transmission. Why there is a statement of FIN packet is ...

15 30 50 per page
1
2 3 4 5
267