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Could a layer-2 loop explain mass duplication of ARP requests, and of ARP requests only? [closed]

We are investigating a standard structured /24 IP network. It is suffering from a high load of broadcasts (~100pps) that is inappropriate for the size of the network (~170 hosts). We found that ARP ...
Nils Toedtmann's user avatar
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1 answer
17 views

What exactly is the ASPATH in data analyzed by BGPdump

I apologise in advance I don't specialize in computer networks, but my tutor gave me this urgent task to analyze some raw data obtained from RIPE. So basically I find a tool recommended by RIPE on ...
Lackind's user avatar
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0 answers
3 views

UDP mDNS on MacOS using C, Rust, JVM - Packets not being received [closed]

I'll do my best to keep it short. While implementing multicast DNS protocols, I'm unable to listen to multicast DNS in either C or rust (However in JVM it works perfectly fine) I am watching network ...
Programmer's user avatar
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0 answers
4 views

How to send a request to DNS server through Postman? [closed]

So this might be a very stupid question, but I tried to search the internet about how to communicate with the DNS server, means that how to send the request and in what form does the DNS server sends ...
Someone's user avatar
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8 views

The relationship between Tun/Tap and Tcp/Ip stack when Tun/Tap connect to a bridge [closed]

I know theres program such like OpenVPN can use tun to interact with Tcp/Ip stack. And I know we can use Tun/Tap with bridge to do things like vm networking. But I wondering when a Tun/Tap connects to ...
hang QAQ's user avatar
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1 answer
15 views

Encapsulation overlapping issue in Vlan Router settings. How do i solve it?

How my setting looks like in the picture I use the gateway as the encapsulation for the router. But everytime i try to add "Developer vlan" (Which in Norwegian is Utvikler) Then i just get ...
Lars's user avatar
  • 11
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0 answers
9 views

High latency when using wifi but average when using LAN [closed]

when I'm using LAN to connect to my router I'm getting around 100Mbps speed with latency under 20ms for download & upload but ping is around 30 ms. But when I switch to Wifi the speed goes way ...
Saikat Karmakar's user avatar
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1 answer
23 views

Built-in variable for cli commands in EEM (IOS-XE)

So i want to write an EEM that basically starts a seperate script where i check what user is logged on, to which group it belongs and then define if they can or cannot run the command. Example: event ...
Mario Jost's user avatar
  • 1,699
0 votes
1 answer
34 views

Network Design: Daisy Chaining vs One Centralized Switch

I am curious as to what the "standard" is when it comes to designing a network with the given constraints:\ cable runs would be more than what cat5e/6 would allow without a repeater\ one ...
Noah A Barcomb's user avatar
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0 answers
45 views

intervlan routing on cisco L3 stacked switches

I am new to this and I am having a bit of a issue trying to successfully perform intervlan routing on a stacked L3 switche(s). I essentially have three SVIs with their corresponding VLANS ( i think) ...
Tormentium's user avatar
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11 views

Exact difference between EAP and EAPoL

In the PSK authentication method, I see only 4 way handshake packets between supplicant and authenticator. They are called EAPoL in the Wireshark What I know that when EAP is carried over LAN (...
tbhaxor's user avatar
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0 answers
12 views

Juniper Bulk CoA example for accumulation of CoA requests

I am working in BNG implementation with Juniper MX960 and I am interested in Bulk CoA feature to address accumulation of a series of CoA requests and commits all of them together. But I don't find any ...
Pablo Xavier's user avatar
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0 answers
9 views

ERR_ADDRESS_UNREACHABLE error intermittently [closed]

I have a website (greatsistema.com) for internal company use that we use from several locations. Intermittently at 1-2 branches (different locations) the site goes down with a ...
Silver Lora's user avatar
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0 answers
12 views

what is the 00-00-00-00-00-00 mac address mean? [closed]

"Hello, I'm encountering an issue with my TP-LINK switch model TL-SG3428X 1.0. Upon inspecting the MAC address table, I've noticed an entry with the MAC address 00-00-00-00-00-00. I've attempted ...
RAJA's user avatar
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0 answers
8 views

I want to log into a nanostation m2 - ubiquiti but i cannot, i've changed my ip and i still can't access it even after restarting it, what can i do? [closed]

I tried to log into a nanostation m2 but i cannot, i've changed my ip and i still can't access it even after restarting it. What can I do or where am I going wrong.
Theo Austine's user avatar
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0 answers
9 views

I can ping my remote server and see that it sends a reply, but it never reaches me again, how do I troubleshoot this? [closed]

I have my local computer, which is connected to my remote server using tailscale. The remote server allows subnet connections, and is hosting a VM. I can ping the remote server over tailscale and get ...
Tue's user avatar
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-1 votes
0 answers
8 views

Setup of Address Plan [closed]

A business group has 4 establishments (Rabat, Casa, Kénitra and Fez) connected in a star topology by leased lines (LL). Given the information below, establish the addressing plan for this group: The ...
Knowledge Seeker's user avatar
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0 answers
16 views

Capture traffic as if pc is not connected? [closed]

Is it possible to capture traffic as if my pc (the one I'm capturing with) is not connected to the network? I'm debugging a connection between two devices that won't connect to each other, unless a pc ...
Tinus81's user avatar
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0 answers
14 views

where the mac address comming from like 00-00-00-00-0A-0B [closed]

hey there i am using some epon olts for provoiding internet to my peoples, now it show some mac address like 00-00-00-00-0A-0B what is this and why?
Raja's user avatar
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0 votes
0 answers
23 views

Why when i connect to my laptop directly to core router no bandwidth receive [closed]

I have two ISPs, each with 500GBs of bandwidth. When I connect to ISP1 from my laptop, I receive an IP address and can run speed tests successfully. However, when the ISP is connected to the core ...
Hazel's user avatar
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0 votes
0 answers
18 views

DOUBT THAT I WANT TO UNDERSTAND [closed]

"Imagine I’m uploading a video to the internet. As the file starts to send from my computer, I’m wondering: When exactly does the 5Mbps upload speed my internet provider promises kick in? Is this ...
Luis Polanco's user avatar
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0 answers
15 views

Network Loops In Unifi Environment [closed]

I have a site where there is a MDF and 4 IDFs with a total of 12 managed Unifi switches. We also have 200 Unifi U6-Pro APs. 50 of the APs have a homerun to our IDFs. The other 150 of them are ...
Preston Gregg's user avatar
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0 answers
14 views

TCP, MEMCACHE, Telnet, and Applications [closed]

I am trying to write a program that sends a specific packet to a host. I am using telnet to communicate with the host, and tshark to capture the network data. When I type config get cluster into ...
Steven L.'s user avatar
  • 183
-1 votes
0 answers
15 views

Link vs Channel [closed]

While reading computer networking, I am confused between link and channel and seen people using this interchangeably (which often bugs me). Language written in books and forums A link refers to the ...
tbhaxor's user avatar
  • 99
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0 answers
15 views

Malicious modification of IEEE 802.11 CSMA/CA protocol [closed]

Is it posible to modify the backoff time of CSMA/MA protocol? If it is, does that mean someone can gain full time access to AP in a public network by set back off time to 0 in order to have the ...
user avatar
0 votes
1 answer
60 views
+200

Is it possible to accomplish Cisco IOS "prefix-suppression" functionality in Junos?

I have a network of three Juniper routers: ge-0/0/* and lo0.0 interfaces are in OSPF area 0. My goal is to have only the loopback addresses in OSPF, but as seen below, the network 10.7.0.4/31 used ...
Martin's user avatar
  • 1,033
-1 votes
1 answer
53 views

Why MLS2 Doesn't Get ICMP Packet To Where It Should?

This is a Packet Tracer lab from Kieth Barker's website with minor modifications. It is intended to exhibit how can we get to the network 10.10.0.0/24 access to the Web Server 23.1.2.2/24 Using NAT. ...
Shadi's user avatar
  • 285
0 votes
0 answers
30 views

How to avoid using aggregate route as a viable route for resolving BGP next-hops?

Let's say, that I receive the prefix 10.10.10.0/28 from two different iBGP peers: root@r1> show route 10.10.10.3 inet.0: 939819 destinations, 2781064 routes (939795 active, 0 holddown, 44 hidden) +...
Martin's user avatar
  • 1,033
0 votes
0 answers
12 views

How to setup a small local network via a Supermicro SSE-F3548 switch [closed]

I have a Supermicro SSE-F3548 switch and want to use it to connect several ubuntu servers in my rack via a 25Gbit connection. At the moment I have the 25Gbit card of one ubuntu 22.04 server connected ...
gha's user avatar
  • 101
0 votes
0 answers
20 views

Trying to understand why in one configuration my router considers my personal website as "malware" but not in the other [closed]

My website is very "vanilla" html/css and yet my AT&T router marks it as "malware". (I confirmed it because I just disabled my internet router's "Home Network Security&...
Thomas's user avatar
  • 101
0 votes
1 answer
23 views

How can I make wireshark focus on only packets being sent to a website and any responses?

I have captured a few TLS handshakes, I would like to focus on one tls handshake and the communication thereafter. For example, I connect to www.facebook.com and www.pinterest.com how do I tell ...
Benjamin Morales Perez's user avatar
1 vote
1 answer
30 views

How can I diagnose the cause of a Dell EMC S5224F-ON discarding output packets?

I have a group of three Dell N5224SF-ON switches at one of my sites. One port in particular is being used to transfer several long-lived, high-volume streams onto a 1Gb/s port. This traffic should ...
David Mackintosh's user avatar
0 votes
2 answers
63 views

One Shop, Two ISPs. Will this work?

My retail shop uses Comcast Cable (calling it CC going forward) as the ISP. I just added Verizon 5G Business internet (calling it VZ going forward) as the backup for the times when CC is down (which ...
RA2024's user avatar
  • 1
1 vote
0 answers
18 views

Juniper and EdgeCore dhcpv6-relay remote-id (option 37)

I have the following problem. I have minimal configuration of dhcpv6-relay agent on QFX5100. Before the QFX, there is an Edgecore switch on which DHCPv6 snooping is enabled. The problem occurs as soon ...
Libor's user avatar
  • 11
0 votes
3 answers
60 views

Core Switches Redundancy Problem

I have network. I have three different networks and 2 vlans. PC0 is a member of vlan 10, PC1 is a member of vlan 20. One of the networks for vlan 10, another one is for vlan 20, third network is for ...
shiva13's user avatar
0 votes
1 answer
35 views

Cisco ASA L2TP/IPsec split-tunnel not working for public Internet

I'm testing a setup using ASA to provide VPN over L2TP/IPSec PSK to support native IPSec clients such as iOS, Android, MacOS, Windows, etc. The issue I'm running into is that when connected, the split-...
640KB's user avatar
  • 101
0 votes
1 answer
35 views

BGP Timers - behavior when Graceful Restart is longer than Holdtime

I am trying to determine exactly why GR timers are recommended to be less than HOLDTIME timers Per RFC4724: A suggested default for the Restart Time is a value less than or equal to the HOLDTIME ...
Jnet's user avatar
  • 1
0 votes
1 answer
36 views

Does Junos prefer route with higher localpref even when the next hop of this route is unreachable?

I had a prefix 2001:db3::/64 learned from two different iBGP peers. One of those BGP peers became unreachable, but the BGP session had not yet timed out: root@e2> show route 2001:db3::5 inet6.0: ...
Martin's user avatar
  • 1,033
0 votes
0 answers
20 views

What is generating the /isan/etc/dcos_sshd_config file?

I posted this on the main stack overflow page, but then I remembered that this niche existed. Figured it was worth a cross-post... During a recent Nessus security scan at work, some of our NX-OS ...
Joe Guichebarou's user avatar
0 votes
1 answer
52 views

Is there a reason to keep the BGP communities received from the uplinks?

It's a best practice to strip the BGP communities from received prefixes which might have a significance in local administrative domain. What are the reasons to keep the rest of the BGP communities ...
Martin's user avatar
  • 1,033
0 votes
1 answer
59 views

Cisco 9300 switch doesn't connect via SSH

I have a couple of switches that are trunked via a LAN cable from another switch. I noticed that these switches sometimes have a hard time to SSH into. I get the error: "Connection timed out"...
Rick151's user avatar
0 votes
0 answers
15 views

How is the number of sub-networks calculated? [duplicate]

I have lately taking interest in networking so I picked up a book to get acquainted with networking principles. The book I have chosen is that of Glen E. Clarke "CompTIA Network+ ...." which ...
Achraf Badiry's user avatar
1 vote
1 answer
46 views

Do two L4 ports perform better than one port?

I have a micro-service HTTP backend, which used Nginx as gateway. I have two domain names for clients: mydomain1.com and mydomain2.com. client ---> Nginx ---> backend Now, I must decide which ...
Yves's user avatar
  • 135
6 votes
3 answers
658 views

Can ARP tables store addresses for other networks?

This is perhaps a weird question, but I'm in a weird situation where I want to route traffic from network A 192.168.1.0/24 to network B 192.168.2.0/24 via 192.168.1.5 (the address of B-router in the A ...
TrisT's user avatar
  • 163
0 votes
0 answers
14 views

Cisco 93180LC nxos 10.2 license question [duplicate]

We have a pair of cisco n9k-c93180lc-ex with nxos 9.3.13 and we want to upgrade them to nxos 10.2. it seems cisco changed the licensing model in nxos 10.2 to smart and we should connect to internet, i ...
Blackmetal's user avatar
0 votes
1 answer
53 views

Cisco 93180LC licensing question

We have two cisco n9k-c93180lc-ex and we enabled bgp and pbr feature and it showed the following error %LICMGR-2-LOG_LIC_MISSING_WARNING: A feature that requires LAN_ENTERPRISE_SERVICES_PKG license is ...
Blackmetal's user avatar
1 vote
1 answer
54 views

Cisco BGP RTBH in EVPN fabric

I have Cisco basic EVPN fabric configuration in DC with two spine and couple of leafs using OSFP+iBGP for underlay fabric. My border leaf connected to my ISP using Vrf CUST. I want to configure RTBH ...
Satish's user avatar
  • 4,379
0 votes
0 answers
63 views

Accessing external server through Azure VPN with NAT

I have three sites and an external server (10.13.16.5) that are connecting to Azure via IPsec tunnels. I do not control the network at the external service but they have given me an address block of ...
CoryL's user avatar
  • 1
1 vote
1 answer
56 views

iBGP exchange all routes?

1.1.1.0/24 1.1.1.0/24 [community 100:1] [community: 200:1] [as path 100 300 500] [as path 200 500] eBGP peer (AS100) eBGP peer (AS200) \ / \ ...
krdx's user avatar
  • 141
0 votes
1 answer
42 views

Cisco nexus C93180YC-EX sflow configuration

I am running cisco nexus C93180YC-EX switch and I would like to enable sflow for collector. I did similar config on 9396PX model and it works but Nexus 93180 is little different. I am running NXOS 9.3....
Satish's user avatar
  • 4,379

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