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1answer
33 views

What layers of the TCP/IP model does an SDN involve?

New to Software-Defined Networks. I know that an SDN involves an Application plane, a control plane and infrastructure plane. By definition, I know that the application plane is in the Application ...
1
vote
0answers
21 views

Cisco FMC stuck on boot menu screen on eve-ng

Any time I restart Cisco FMC on eve-ng, it doesn't boot the default image. When I connect via VNC and press enter or type the image version to boot, it doesn't respond to laptop keystrokes . I was ...
4
votes
1answer
60 views

Cisco Nexus 9300 TCAM carving

I have Cisco Nexus C9396PX L3 switch and i have configured bunch of ACL (inbound) on it to deny/permit traffic. now if i am trying to add more ACL then getting error that your TCAM table is full. here ...
0
votes
1answer
32 views

LAN to WAN IPv4 address mapped to LAN server through NAT Rules or other

I need to set a rule that allows me to connect BOTH from OUTSIDE the LAN (from the "internet" to the Internal server at IPv4 address 10.64.0.50 via port 22, by running ssh://1.2.3.4 -p 22; AND From ...
0
votes
3answers
36 views

packet filtering using bridge vs router

I have a question about the bridge vs router packet filtering using firewalls. I know the basics of the router and bridge and on which layers they work. I just wanna know that on bridge how does ...
4
votes
3answers
2k views

How does Deep Packet Inspection work with encrypted packets?

I've been reading up on Deep Packet Inspection for Software Defined Networks. However, I know that some applications use encryption to evade Deep Packet Inspection. Is there any alternative (such as ...
0
votes
0answers
19 views

Cisco Switch (not ISE/ACE) redirect HTTP server to HTTPS

I wish to enable HTTPS server on Cisco , and redirect HTTP to HTTPS, instead of simply disabling HTTP. Is this possible? Current config: no ip http server ip http secure-server
0
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0answers
17 views

Changing default gateway IP address from a failing switch to a VRRP configuration using failing switch plus two others

I have an HP 5406 switch that has been the default gateway for years. This switch is beginning to fail but still has customers Ethernet and Fiber on it. Everyone on my network, 800 or so devices all ...
0
votes
1answer
17 views

Design of 2 Lans Connected to a Watchguard m570 firewall

I have this architecture (without the firewall). I bought a Watchguard M570 as Firewall to add it in my network. My Question is : Could i use my watchguard and connect this one to my 2 LoadBlancers ...
0
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0answers
6 views

Add Watchguard M570 Firewall to my Network that contain 2 LoadBalancers [duplicate]

I have this architecture (without the firewall). I bought a Watchguard M570 as Firewall to add it in my network. My Question is : Could i use my watchguard and connect this one to my 2 LoadBlancers ...
0
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0answers
22 views

I can't get NTP to work in cisco packet tracer

I configured a router and a server, enabled NTP on the server, set the server as NTP server on the router but it still doesn't synchronize the time
1
vote
1answer
41 views

Understanding TCP's slow start exponential increase congestion control policy

I was learning TCP slow-start exponential increase congestion control mechanism from Forouzan's book. It says following: The size of congestion window (cwnd) starts with one maximum segment size (...
0
votes
2answers
42 views

Can / Is CSMA/CA used in wired network?

I learnt why CSMA/CD cannot be used in wireless protocols here. Here is what the answer says: Wireless transceivers can't send and receive on the same channel at the same time, so they can't detect ...
0
votes
3answers
54 views

High Throughput on BGP Multihomed Network

I've One site connected to my server location via BGP over MPLS and at my server location 2 edge routers cater these WAN links, and are further connected to Servers via switches. Now, Is it possible ...
0
votes
2answers
96 views

What is the difference between connect and active states of BGP?

What is the significance of having two different states in FSM when both try to establish TCP Connection?
0
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0answers
14 views

Is it possible to simulate ad-hoc network in ONE Simulator?

Is it possible to simulate ad-hoc network in ONE Simulator? I am trying to simulate ad-hoc network. Is it possible?
0
votes
1answer
39 views

DHCP when you have both layer 3 and switch ports

I have the following config: ip dhcp pool Vlan10 network 192.168.1.0 255.255.255.0 default-router 192.168.1.1 interface GigabitEthernet0/0 ! interface GigabitEthernet0/0.10 encapsulation ...
0
votes
1answer
52 views

What is the theoretical difference between the link layer and the network layer?

I have run into this problem again and again and have never found a sufficient answer to this question. I want to understand the fundamental, theoretical difference between a layer 2 network and a ...
0
votes
1answer
18 views

Question on windowing and determing connection speed

Hi i'm just learning computer networks and i have learned about windowing in tcp And my question is does we determine connection speed using windowing? I mean computer know the number of packets and ...
0
votes
0answers
44 views

EIGRP Holding Time Expire on VLAN Interfaces

I configure 2 Layer 3 Switches with VLANs and EIGRP route. But it always return a message like this : %DUAL-5-NBRCHANGE: IP-EIGRP 2019: Neighbor 192.168.20.253 (Vlan20) is down: holding time expired ...
0
votes
2answers
44 views

understanding fiber optics layers architecture

I'm studying the history and technical details about fiber optics and I'm having trouble understanding which are the different layers that exist and have been used over fiber optics. For example, I ...
1
vote
1answer
18 views

Is this extended acl valid?

Permit tcp any eq 80 host 10.23.3.10 eq 80 I would like to permit any address to reach the host 10.23.3.10 strictly on port 80 This is a school lab exercise. The question goes, for inbound traffic ...
0
votes
1answer
25 views

Juniper SSG20, reset to factory default

I have an Juniper SSG20 that I have tried to reset to factory default. I have tried the pin hole reset method but to no avail, and the serial console doesn't indicate that the procedure is started, ...
0
votes
1answer
43 views

Understanding EUI-64

I was reading Forouzan's book. It says following: In IPv4 addressing, there is not a specific relation between the hostid (at the IP level) and link-layer address (at the data-link layer) because ...
0
votes
1answer
31 views

How to use twisted pair as console to manage Cisco devices?

Is this possible to use a normal twisted pair cable or roll over to manage Cisco devices through console port? (without any converter to USB) I tested before a roll over and connected it to Cisco ...
0
votes
1answer
25 views

NAT on the endpoint

NAT is normally performed on the router to translate addresses from one network's address space to another's. Is there ever a reason to perform NAT directly on the endpoint instead? For example, if ...
1
vote
1answer
70 views

Cannot Connect to one single ip address in VLAN

I have 3650 Switch which contain number of VLAN and I am unable to connect to one ip address from specific VLAN. But routing is properly configured and there is no ACL applied. Even end device has no ...
0
votes
0answers
22 views

Is 10.0.0.0/24 Class A or C [duplicate]

So I'm trying to understand IP Addressing and I seem to understand but then I came across 10.0.0.0/24 as an example I got confused because I thought 10.0.0.0 is a Class A address, but if it has /24 ...
0
votes
0answers
11 views

What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
4
votes
2answers
70 views

What does a transition from static IP to BGP look like?

We initially got a /30 from our upstream and now we're ready to start running BGP to advertise our own /24. What does that sort of process typically look like? Does it likely require some prior ...
0
votes
2answers
41 views

How to manipulate Openflow data packet to change IP adresses?

I want to change the IP addresses of source and destination using Pox controller. Is there any algorithm to fulfill my requirement and where to place it in Pox ?
0
votes
1answer
34 views

GPON upstream frames capture

How capture GPON upstream traffic ? Some professional tools exist: GPON doctor, GPON Xpert, displaying the GPON frames, etc, but is it possible to perform this task without using these tools ? My ...
1
vote
0answers
61 views

HTTPS QOS and policing

In our office, everything runs on HTTPS. We have softphones and web-based clients which are high priority. We also have Google search, maps and other low priority websites that should work on best-...
0
votes
1answer
15 views

how to enable webgui after running auto-secure on ASR 1001-X Version 16.09.02

I've tried doing the following on the cisco web-guide but have gotten no luck in restoring the webgui after running auto secure. Thanks in advance
0
votes
1answer
17 views

UniFi CloudKey controller gen1 gui on port 443 won't accept username and password

So, as the title say I can not log in CloudKey management page on port 443, username and password are not accepted, but on the device management page, on port 8443 those same credentials are accepted. ...
2
votes
2answers
138 views

How does aggregate routes behave in BGP?

If a router received two BGP updates for the same prefix and both these updates are aggregate paths how do the router decide which one to take? Let us say that it needs to decide based on AS Path ...
3
votes
1answer
95 views

Get the raw binary stream from an optical fiber

How get the raw binary stream from a fiber ? Assuming we have a SFP (ethernet, FC, GPON, other), this transceiver is not protocol independant, and will treat and interpret the binary stream received ...
0
votes
0answers
20 views

my question is about How to Subnet my network of 2 routers 1 switch (2vlans) and 2 laptops? [duplicate]

Loopback1---R1-------z--------R2---L2 | | | | |______S1_________| || ...
0
votes
0answers
51 views

cisco zone-based policy firewall

How to limit the number of established connections for each host, that connect to the service? In the policy settings, I found only blocking by the number of half open connections. parameter-map type ...
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
2answers
94 views

In IP, to what extent are the network addresses coordinates?

Routing of data relies on being able to reach the destination address. There are network addressing systems proposed where the addresses are coordinates, Vivaldi from MIT, for example. The routing in ...
2
votes
1answer
73 views

When TCP sender window shrinks?

I was learning TCP from Forouzan's book. It explains sender side window as follows: In that it defines size of receiver window as follows: rwnd = receiver buffer size - number of bytes waiting to ...
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 ...
0
votes
2answers
64 views

What does the Cisco HTTP client (help to) do on a switch?

While checking for vulnerabilities in one of our Cisco switches I came upon this: CVE-2019-12665. Excerpt from the CVE: A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software ...
1
vote
2answers
80 views

Cisco Catalyst 9410 - Using Default Gateway versus ARPing for locally connected host

I may be missing something extremely simple here, but im at loss trying to figure out what this Nexus switch is doing. Here is the topology: DISCLAIMER! I had made a mistake on the diagram by ...
0
votes
1answer
27 views

IPSec point to point Cisco 2800 to Palo Alto firewall

Is there a way to use a cisco 2800 router to create a point-point tunnel to a Palo alto 3020 firewall with support for 6 vlan's on the cisco side. I want to create a tunnel from a new office to my HQ ...
0
votes
1answer
79 views

ports and security

I'm thinking about how the "port" operates for the network connections and tried reading the CCNA cert. guide to understand the details, however, I need to clarify doubts: does occupying all the TCP/...
0
votes
1answer
27 views

Finding MSS for a remote connection that uses tunnelling

I'm working on a codebase where we're trying to test network health by verifying if we can ping the remote site having payload = MSS without any packet fragmentation (using -df flag). Typically, for ...
0
votes
1answer
66 views

What is a substrate network?

Actually I am reading a paper for school homework. This paper is called : "JASPER: Joint Optimization of Scaling, Placement, and Routing of Virtual Network Services". They use the term "substrate ...
0
votes
3answers
68 views

Access a pc web service with different ip/mask in on-site network

I tried to get a setup working to make the following scenario work: Access a pc web service hosted in a different IP range/mask than the rest on-site PCs. Details: We have a network setup with a ...

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