0
votes
2answers
11 views

Does the distribution switch forwarding the broadcast message?

Hello guys, If one PC on the picture shown sends broadcast message, does the distribution switch forwarding the broadcast message? Thank you
0
votes
0answers
5 views

DMZ configuration [on hold]

I wanted to have a little advice, I want to configure a DMZ, and I wanted to know if you could advice me some devices from HP and Cisco please ? Thanks in advance !
0
votes
0answers
14 views

How to connect high-availability routers to high-availability firewalls

I have two Juniper routers (a CRX340 and a CRX320), each with a leased line, on the same IP range. They are designed to be connected together on specific network ports so that the CRX320 takes over if ...
0
votes
0answers
12 views

IPv6 router advertisement message containing only the source link layer address

According to rfc4861, the destination address of a RA message is either the all-nodes multicast address or source address of the received RS message. I captured one ICMPv6 message sent by my ISP, ...
0
votes
1answer
32 views

Is it possible to remove/block a EIGRP neighbors connection via Switch?

I have a 4 routers that connected each other via an multilayer switch. Is it possible to remove/block an EIGRP neighbors via Switch? For example, I have a topology like this : I wanted to remove ...
0
votes
0answers
18 views

Cisco ASA 5506-X create a NAT rule via GUI/cmdline

Hi the Stack Community ! I have some problems with creating a NAT rule with that Cisco device, (of course you already undestand that I m a beginner with Cisco devices ^^) The configuration schema ...
0
votes
0answers
8 views

“Unknown” identifier in OID for IP SLA

When I am doing a SNMP walk on the OID bellow. I get the correct IP SLA configuration, but I will get a set of random digits trailing which can be seen in the row bellow. What is the meaning of ...
0
votes
0answers
13 views

Pure layer 2 programming. How to implement purely in layer 2 (no IP addresses, only MAC) [on hold]

I work with many network connected embedded devices that I have complete control over, and moreover have realtime (boot up -> responding on network) responsibilities. Often times they don't need to ...
1
vote
0answers
13 views

How is the source link-layer address in IPv6 router solicitation(RS) messages used?

When I analyze the router solicitation(RS) messages, then they contain the MAC address of the sending host. How does the router use this MAC address seen in ICMPv6 message? Does it simply use it as a ...
1
vote
2answers
30 views

How does the server know how to respond to a UDP packet? [on hold]

As far as I know, UDP ports and OS sockets are mapped only by the (local port, local address) pair. In other words, the receiver side's OS does not keep a state of (remote port, remote address) pair (...
0
votes
0answers
12 views

Is it possible to multiply PPPOE ISP connection with LAN switch without using router? [on hold]

I don't have much knowledge about networking or networking devices. I hope I am not asking something too stupid. Recently I am facing a problem. My router circuit fried due to lightning storm. But I ...
0
votes
0answers
18 views

No MAC address in Wireshark packet capture? [on hold]

I have a WatchGuard firewall as our firewall/router, windows server 2008 R2 standard for DHCP, 2 windows 10 machines and a Hikvision DVR. Machine 1 could see the cameras no problem for about a week ...
2
votes
1answer
29 views

Will this SFP Transciever run over OM1?

I'm fairly new to Fiber cabling. I have a OM1 cable (running 750 metres) already installed on a site that currently works fine on a old system that is being upgraded. I'm trying to find out if these ...
0
votes
0answers
17 views

Can a webpage affect another device on the same network? [on hold]

The following just happened to me: While i was browsing a site on my pc i used my phone to google for something. Instead of showing the search results i was redirected to the same page that was open ...
2
votes
1answer
16 views

Pseudowire and LSP

I can't understand the concept of PW (pseudowire). Does making a pseudowire mean that we are making a dedicate path with reserved resources for a service with defined requirements? so What are its ...
0
votes
1answer
21 views

Network interface issues an ARP request to get the MAC address of an actively used gateway

My network interface actively uses a gateway to send IP packets to other networks. There is already an ARP entry in the cache for the IP/MAC association for the gateway. Is it normal that my network ...
-1
votes
0answers
19 views

What ports does DHCP typically use other than 67 & 68 [on hold]

Could someone explain me in understanding the ports used by DHCP. I know that in order to assign a dynamic IP the DHCP server would talk to the client over the dest port 67. 1.Other than this ...
0
votes
0answers
15 views

I can connect to the second router but no internet? [on hold]

Before I ask my initial question, I'll explain the setup and background. I am helping a business fix their internet after a camper reported that the internet had gone out. I went to check, and sure ...
0
votes
0answers
25 views
+100

is there a way to make subnetworks by user or user isolation on Algo VPN?

im building my company VPN with algo vpn hosted in Google Compute Engine to connect two applications, I need it to connect betwen clients with same user. Example: "User A" -can conmunicate with- "...
2
votes
1answer
95 views

Why are DHCP ACK and REQ messages broadcast in Link Layer?

When I look at the protocol, I see that DHCP Request and Acknowledgement are both broadcast in the link layer. However at that point, both sides actually know each other's MAC addresses. Why do they ...
-1
votes
3answers
40 views

Why do we need an ethernet MAC address? [duplicate]

Don't think it's a duplicate. I've searched really many articles and couldn't find the satisfying answer. I understand : how ARP works MAC address is an unique address for each NIC IP is network ...
-1
votes
0answers
9 views

How to hookup a device on ground floor to local network [on hold]

I have bought a ASIC Mining device (Insillicon Z9) which I would like to install in the basement of my apartment building. Basement is ground floor and I live on the 7th floor. There is no internet ...
0
votes
2answers
25 views

Network Packet that allows maximum throughput

I created a basic wireless system between two microcontrollers. Each uses the on-chip UART and an HM-TRP radio module to communicate with each other. Eventually I'll have a master-slave setup where ...
1
vote
1answer
23 views

Create Accounting for Internet and merge ADSL, is there any way? [on hold]

I have 4 Simple Wireless ADSL Modem that 4MB, 8MB, 16MB, 40MB Internet BW. I have one HP Server with 4 Network Ethernet Ports. I have 7 LAN based PC's, 2 Network Printer and some wireless station ...
0
votes
0answers
22 views

Direct wireless link, what better equipment? [on hold]

To establish a wireless link 1.4 km away, without obstacles, which is the best equipment? 1 - Tp Link Cpe210 / 2.4Ghz / 9dbi / 300mbps or 2 - Intelbras Wom 5000i / 5Ghz / 12dbi / 150mbps
1
vote
0answers
19 views

Setting up a GPS TCP server [on hold]

I am working on a project where we are using a GSM modem with built in GPS system. The modem has setting to send GPS signal NMEA format to a remote TCP server. Can someone consult on where should i ...
0
votes
0answers
18 views

Block diagram for SDH hierarchy connecting two LANs [on hold]

How to represent in a block diagram all the devices used in the connection of two LANs that implement IP and dispose of a 2 Mbps link, in a SDH-STM 4 hierarchy?
0
votes
1answer
32 views

Do RIPE Atlas probes need a public IP address?

I'm new to networking in general, and have only a vague understanding of network topologies. Looking at the RIPE Atlas info video, it would seem that any user can install a probe and that then gets ...
1
vote
1answer
42 views

can single Ethernet mac handle two RJ45 ports?

I have two RJ45 ports and one Ethernet MAC can i interface them without using the switch. it has to be used in my final year engineering project
0
votes
1answer
14 views

I have a No-IP hostname which is linked to my public IP address. Is it possible to connect to a computer on that network using the NO-IP hostname

I'm really sorry if this question seems stupid. mynoiphostname.ddns.net is linked to my public ip xxx.xxx.xxx.xxx. On this network, I have a computer whose local IP is 192.168.1.2. How can I connect ...
0
votes
0answers
16 views

Squid cache_peer not working properly [on hold]

I have the following setup in my network Host ---- Squid(1) ---- Squid(2) ---- Internet the first proxy forwards all the traffic to the second one, the problem is that the second proxy won't ...
1
vote
1answer
32 views

Change VLAN id in trunk

I have 3 L3 switches. They're connected to each other with a trunk (in which I need to define the allowed VLAN's). On SW1 I have for example vlan 100. On SW3 I also have vlan 100, but it's another ...
0
votes
0answers
22 views

Is it better to connect your WAN to Switch or to Router? [on hold]

Which option is better? Connect your WAN directly to Switch , and then to router Connect your WAN directly to Router, and then to switch If you connect WAN to your Switch, you will be able to use ...
0
votes
0answers
35 views
+100

Cisco ASA context OSPF configuration issue

I've two cisco ASA configured in active/active HA. ASA is connected to switch with port-channel. Switch configuration: interface Port-channel47 description ASA2 switchport mode trunk switchport ...
0
votes
0answers
17 views

Firewall with private WAN (MPLS, VPLS, MetroEthernet) [on hold]

Do the private WAN architectures (MPLS, VPLS, MetroEthernet, etc) for sites interconnections, require a firewall ? (often saw online architectures examples, best practices, etc, without firewall...)
1
vote
1answer
24 views

Simple NTP question

Setting up NTP on a cisco 3560 so clients can be all on the same time. The switch it only used at layer 2. Outside of having a management VLAN for SSH, there isn't currently any config for anything ...
0
votes
0answers
11 views

With large file transfer packets are dropped with the error “IDP detection OOO Exceeded Max” on encryption/decryption engine subsystem

We have an in-house application for sending large files. Using TCP/IP this application uploads the files to a server on our main office network and then sends a link to the file as part of an email. ...
0
votes
1answer
21 views

Change firewall rules of a Cisco Router from network

I'm looking for ways, methods or workarounds to: Change firewall rules (WAN/LAN accept-deny) of a Router from networking, through Linux command or PHP script, can be a socket, or rest service, soap ...
0
votes
1answer
32 views

How does a firewall receiving an image file approve it?

I was recently told that a Firewall configuration for the WatchGuard device does not allow the user to login and alter the configurations. Instead, you send an encrypted image file containing the ...
0
votes
0answers
61 views

Sophos UTM WAN interface doesn't respond to ARP requests

I've sent this very question to Sophos Support but I feel that asking here might increase my chances to get an answer. The short question is: what could be the reason for my Sophos UTM VM WAN ...
0
votes
0answers
15 views

Modify IP header received from tun device and hand it over to a real net interface to send it to the remote host [on hold]

The question is as the title describes, what I am trying to do is: create a tun device, read the IP packet from the device; change the dst_addr, dst_port, src_addr, src_port and the port in its ...
0
votes
2answers
48 views

EIGRP Routing Issues

I had an issues about EIGRP. But first, here's the topology : I've done EIGRP Routing, but it's kinda strange. PC0 -> PC1 is able to ping, PC3 -> PC2 is able to ping. But, I can't ping PC0 -> PC2, ...
0
votes
1answer
35 views

Why is devices on Subnet 2 (Router 2) can access devices on Subnet 1 (router 1) but not vice versa? [on hold]

I am new to the world of network so please bear with me. I have chained two routers to create two subnet at my home. I have two routers and second router is connected to my ISP ADSL modem router by ...
0
votes
0answers
49 views

Different Source and Destination IP to and from ISP [on hold]

Could somebody tell me which model the ISP are using ? I have a leasedline WAN with following information. IP: XXX.XXX.XXX.123 Gateway: XXX.XXX.XXX.126 Subnet: 255.255.255.248 The problem is every ...
0
votes
1answer
22 views

Use one ip for multi VLANs in linux without netns and not act as a router

this is what I've tried, however when two devices have this configuration I get tons of garbage ARP/DHCP packets on the network. would appreciate any guidance towards the right direction, thank you. ...
0
votes
0answers
19 views

Errors in my VLSM addressing scheme attempt? [on hold]

I'm practicing addressing schemes using VLSM for my exam. The question and my answers are below. -I wasn't too sure about the number of hosts for the R1-R2 and the R2-R3 links. Are they correct?
0
votes
0answers
35 views

TCP behavior upon failure: weird RTO timer and retransmissions [on hold]

I’m currently looking at the behavior of TCP upon failures, and more particularly at how does TCP send retransmissions when the RTO timer expires. I have run several experiments and I’m not always ...
0
votes
1answer
38 views

LACP to Fix Switch Bottleneck?

I have a bottleneck affecting traffic. There are 4 switches with each of them running a line to the next to provide internet. I haven't played around with LACP LAG too much and am wondering if the ...
0
votes
1answer
35 views

Latency in Network [on hold]

My company uses trading application where latency is utmost important. I have few ideas but really dont know how to implement. Like I want to know 1) How can I Prioritize applications by 802.1q tag. ...
0
votes
0answers
21 views

DHCP Doubts & Questions [on hold]

I have few questions related to DHCP 1) In DORA process when client requests for the IP address can I call it as a packet or a frame? 2) If DHCP is not able to allocate IP address say when client ...

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