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votes
0answers
19 views

confused in incoming and outgoing vc number

When filling out the forwarding table for VC, how is the incoming VC number deduced? what is the trick? For example in the diagram shown how are the incoming and outgoing VC numbers found out for a ...
1
vote
0answers
39 views

Unable to Initiate a VPN tunnel using IKEv2

I'm having an issue with a VPN tuunel between my Firewall (ASA 5516-X) and a third party firewall so I can't check the config in the second firewall. So I decide to debug my firewall and I realized ...
0
votes
0answers
13 views

what is difference between main ring and sub ring in ERPS?

According to my knowledge , we can configure multiple ERPS rings in service based. But there is a concept of main ring and sub ring.Please explain significance of each.
0
votes
0answers
17 views

Multiple GETVPN groups inter-connectivity issue

Greeting Everyone!! I'm trying to stimulate an environment where I've DC and DR locations and remote sites have to access DC/DR services. For security, GETVPN is used. Initially tried using only one ...
23
votes
7answers
5k views

Why isn't UDP with reliability (implemented at Application layer) a substitute of TCP?

TCP provides reliability at transport layer while UDP does not. So, UDP is fast. But, a protocol at application layer can implement reliable mechanism while using UDP. In this sense, why isn't UDP ...
1
vote
1answer
43 views

Is OSPF router ID unique per area?

I found online that the router ID must be unique within the OSPF domain. But what exactly is an OSPF domain (an area?). Let's take the following topology: Can R1 and R5 have the same router ID, as ...
1
vote
1answer
42 views

How much of an IPv6 address should be considered a single “identity” when counting votes [closed]

I'm building a web platform that uses upvotes and downvotes on each piece of content to bring good content to the top. It's important that it's non-trivial for this voting to be rigged, and previously ...
2
votes
1answer
54 views

Collect UDP packets lost during iPerf test

I'm testing my network infrastructure where I'm using iPerf and UDP protocol. I'm using the following: On the server side: ubuntu@ip-172-0-1-11:~$ iperf -s -u and the client side: ubuntu@ip-172-2-...
0
votes
1answer
41 views

Why Access ports should have the same trunk native vlan? [closed]

In the current switch Management VLAN is 48. Can you please someone explain it to me, why we dont give trunk native VLAN as 48, and we configure the same as access VLAN? Thanks in advance.
0
votes
1answer
27 views

Inter VLAN routing Issue with 4G connection

We have new branch and we will connect it through 4G routers "WAN connection" and L3 switches as below Fig. From 1-Branch Switch i can ping the 2-Branch Switch, but from (PC-1) i cannot ping (2-...
0
votes
1answer
25 views

Meraki MX64, CISCO SG200 Switches, VLANS

Having issues with allowing traffic across VLANS. I have setup a Meraki MX64 and Cisco SG200 Switches to use 5 VLANs (1-5, 1 = default). I configured some ports on the switches to be members of 2 ...
0
votes
1answer
44 views

What exactly is fragment free switching?

Most commonly refered to as a compromise between store-and-forward and cut-through switching, this method involves storing the first 64 bytes of the ethernet frame in a buffer and then forwarding it. ...
0
votes
1answer
38 views

how to send tcp packets between 2 hosts on same network

iam using mininet network simulation tool and i need to send tcp packets between 2 host hosts are 10.0.0.1,10.0.0.2 ,i used the hping3 but is sends ip packets also i used this command hping3 -c 1 [...
1
vote
1answer
65 views

Why STP has to be disable on Trunk Ports?

I have 5 Switches on a Private Network 10.0.0.0/8 with 8 Vlans. On Access ports is running Rapid STP. On Trunk Ports between Switches should i disable STP or not? I would be very pleased if someone ...
1
vote
1answer
24 views

Difference Between PAT with pool or Interface/Loopback?

I'm just wondering what difference does it make when doing PAT with same IP defined in pool or assigning IP on Loopback and overloading that interface. ip nat pool MYPOOL 1.1.1.1 1.1.1.1 netmask 255....
2
votes
1answer
79 views

What is the purpose of a switch routed port?

From my Cisco CCNA documentation: Routed ports are used for point-to-point links. Connecting WAN routers and security devices are examples of the use of routed ports. In a switched network, ...
1
vote
2answers
56 views

How to do subnetting on IPV6 for non nibble boundaries?

As I was reading this article on How to: calculating IPv6 subnets outside the nibble boundary https://blog.apnic.net/2018/08/10/how-to-calculating-ipv6-subnets-outside-the-nibble-boundary/ The author ...
1
vote
3answers
80 views

Understanding how VPNs work?

I am trying to understand how VPNs work. Most of the posts/blogs on the internet say that all your traffic is routed through a VPN server. This sounds like proxy to me?? Another point that is commonly ...
2
votes
1answer
49 views

Is this possible (NAT??)

I have a device on another network, say it's IP is 10.1.1.1 I want to ping it from my own network, say host 192.168.1.1, but I want to ping an address in my local segment to do so,so 192.168.1.2. Is ...
1
vote
2answers
30 views

Private Vlans - Promiscuous port [closed]

If I had a private vlan on my switch, can it communicate with a 'normal' vlan on that same switch ? Is it only between secondary private vlan that communication is restricted ? It seems to be the ...
4
votes
1answer
51 views

Regarding Administrative Distance

Different vendors use different Administrative distance for the same protocol.For example, in a Cisco router, the eBGP, AD value is 20, whereas in Arista routers, it appears different(i believe, 200). ...
25
votes
3answers
4k views

What is “oversubscription” in Networking?

I have a question about oversubscription in networking. I read a lot of documentation but I still don't understand what it means. I read the following on the Cisco website, oversubscription of the ...
0
votes
1answer
15 views

How to use IXIA IxNetwork 8.40 to send bi-directional traffic between CPE and router

My setup is: IXIA -- CPE -- router -- IXIA I have one end of the IXIA connected to CPE, and getting private IP (DHCP from CPE). Other end is connected to router side and has public IP. Traffic ...
0
votes
1answer
19 views

Filtering http/https traffic destined for a juniper router

I need to find a way to harden my network so that all juniper routers reject web management and any http / https traffic that is destined for them specifically. This is what I came up with so far: ...
0
votes
1answer
49 views

TCP sequence numbers in Actual Transmission vs. in Wireshark Capture

Whenever, we do a wireshark capture and Follow--> TCP Stream, we see the sequence numbers as fixed values. In reality, if this were the case, the intruder can easily predict the transmission patterns....
0
votes
1answer
47 views

Ping error ipv6

I am able to ping a PC1 to R1, Pc2 to r2 and PC3 to R3. All routers can ping each other. PC's can also ping themselves but I can't ping different PC's, I also cannot ping a PC to their own Gateway. ...
0
votes
2answers
43 views

Pinging my own pc

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, ...
9
votes
2answers
826 views

Does anycast addressing add additional latency in any way?

Does anycast addressing, in itself, add any additional latency to network connections? Specifically, if you had two servers located in the same data center that had extremely similar routes/number of ...
0
votes
0answers
17 views

Can you get more than 128 hosts with /25 mask? [duplicate]

I had an exam, and we were given an IP 199.177.63.0/25 and were asked to create two subnets of 66 and 10 hosts. Would first subnet already take 128 addresses? Sorry for stupid question.
1
vote
2answers
66 views

Is a “LAN” a layer 2 or a layer 3 concept, in TCP/IP?

I think my question is purely theoretical and a matter of definitions; it derives from the fact that a L2-switch with VLAN capabilities is able to "create" different virtual LANs, and thus I am led to ...
2
votes
0answers
17 views

How to use the monitor traffic only shows the In packages in Juniper EX480?

I use monitor traffic tool: run monitor traffic interface ae16 commad: 19:04:52.820205 Out arp who-has 16.23.40.133 tell 16.23.40.134 19:04:52.820210 Out arp who-has 43.243.33.66 tell ...
1
vote
1answer
42 views

Is there a way of Juniper to avoid the vast ARP requests?

In my Juniper router the interface always send ARP requests for some non-using IP address. Is there any issue there? and whether there is a way of Juniper to avoid the vast ARP requests? Is it ...
3
votes
3answers
124 views

How to add multiple ip address in destination ip in acl rule

Iam trying to block a certain host from sending any message to any host in the network is there is a way to do that or i have to deny host by host ?
4
votes
1answer
130 views

How to connect QSFP+ transceiver with MPO connector and SFP+ transceiver with LC connector?

In data center application, 40G QSFP+ transceivers with MPO connector and 10G SFP+ transceivers with LC connectors are most common transceivers. But, with two different connectors, how can we make a ...
0
votes
0answers
35 views

Packet tracer icons too small

I am a bit new in packet tracer. I love it, but the icons are too small. I tried to increase the font size, but this is not changing icons size. As you can see here, the text is bigger than the icons, ...
0
votes
0answers
19 views

Topology/wiring recommended for my home network [closed]

I come to you to see if you can advise me on the best way to connect the ISP router and openwrt router (which provides wireless access, DHCP, basic local DNS and in the future VPN) in my house ...
1
vote
1answer
75 views

Port Channel Hybrid Port Issue

I have a Dell Sonicwall NSA 4600 running the latest firmware with an Interface that's configured to have a secondary redundant port. This interface also has a VLAN sub interface assigned to it. On ...
-1
votes
1answer
35 views

VPN server acting as a client for another VPN server [closed]

I was wondering if it's possible to have a VPN server that goes though another VPN server. Here a scenario that might explain my idea better: I have 4 computers 'A' - My Windows machine 'B' - My VPN ...
4
votes
2answers
100 views

Serial interfaces of router are used nowadays?

I've heard the use of serial interfaces of router is not so common in the current network environment. But in some exams like CCNA, you can still see questions including the knowledge of serial ...
1
vote
1answer
38 views

SNMP object not in the MIB

i'm working on an SNMP app that needs the ptopo MIB object with the object ID of 1.3.6.1.2.1.79 after enabling SNMP v3 on 2 layer 3 switches dell z9100-on brocade slx 9140 and creating a view on ...
0
votes
1answer
35 views

Difference between port-channel lacp fallback individual VS. static?

What is the exact difference between: port-channel lacp fallback individual port-channel lacp fallback static
3
votes
1answer
58 views

BGP | Advertise a summary prefix out to customer location

I don't know what I should be using for this or how I should go about it. In my lab where I am testing out the BGP configs that I've learned I want my ISP topology to have a summary prefix for the ...
1
vote
1answer
31 views

Getting Mulitple Source IP addressess when doing Port Monitoring

I have a Cisco 2960 switch that I'm trying to find which device IP address is connected to each port... My Setup: monitor session 1 source interface gigabitethernet 0/5 monitor session 1 destination ...
0
votes
1answer
41 views

Response time of TCP congestion control

I would like to know about the overall latency of the TCP congestion control for adapting to varying network conditions. Specifically, my questions are: How fast can the system react after a change ...
1
vote
2answers
80 views

How to measure max bandwidth with Wireshark?

I'm trying to measure the max bandwidth usage of my LAN with Wireshark. I´ve done several packet captures but I don't know how to obtain the max bandwidth usage. Any Idea? Thank you in advance
-1
votes
1answer
21 views

Stable connectivity in a high-density residential WiFi environment? [closed]

I live in a densely populated area and my devices see 10-20 wifi networks at any given time. Once in every few minutes a ping to my router goes up to the point of timeout and the device loses the ...
1
vote
1answer
36 views

Remote Host Neighbor Cache Entry State after Neighbor Solicitation request

When a Host A sends for the first time a NS request to another Host B, host B answers with a NA. In Host A Neighbor Cache, the state Entry for host B gets from INCOMPLETE to REACHABLE, when NA comes ...
4
votes
3answers
65 views

JunOS, access mode interface asks for a vlan

I'm kinda new to networking so I'm going to do my best to try explain my issue. The issue that I have is that I want to delete all default configuration for my xe interface. Current configuration: ...
3
votes
2answers
60 views

Configuring Cisco ASA DAP policies from CLI! (Automating bulk task)

So I have given a task to add 1000s of DAP policies after main DAP file crashed and backup is not available due to unfortunate reasons. There is predefined way of doing it through ASDM which is very ...
0
votes
1answer
54 views

Why the Ack number is bigger than the last Seq number?

Why the Ack number is bigger than the last Seq number? you see the Ack response for each two TCP packages. but there I have a question, you see the Ack response for Seq=19997, Seq=22893 and Seq=...

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