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30 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
24 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
68 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
10 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
69 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
60 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
137 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
94 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
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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
36 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
72 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
74 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 ...
0
votes
3answers
55 views

Connecting 2 buildings on same site via fiber

If I have 2 buildings on the same site, connected to each other via a fiber connection and they both run to the same ISP, would both buildings need to be connected to a firewall? For the main ...
0
votes
2answers
51 views

How can I connect (stack) two Cisco SG350 together?

I am building a storage network, physically separated from the data network. I have two Cisco SG350-28P-K9 V02 switches: One on the basement. Has two NAS, two ESX servers. (in use) One on the 4th ...
1
vote
1answer
34 views

Arpping responding with Cisco ASA interface mac address and mac address of machine

For some reason our Cisco is responding to arp requests between machines on the same switch. It's not breaking anything but it is slowing initial connections. I've been making a lot of changes on the ...
0
votes
1answer
35 views

how can we route two routers on one switch in a different network ip

I am trying to connect two routers in one switch to ping each other using IP route . router 0 has 192.168.10.1/24 gi0/0 router 1 has 192.168.20.1/24 gi0/0 I tried putting switch-port trunks on both ...
0
votes
0answers
89 views

why iperf3 UDP throughput is lower than the TCP throughput?

I'm running an iperf3 throughput test from my PC to another one, going through a router. I've tried the same configuration for TCP traffic and for UDP traffic. However, for UDP traffic, I get worse ...
0
votes
0answers
18 views

The huawei S2300's interface protocol become `--`

The huawei S2300's interface protocol become --: <HW>dis interface brief *down: administratively down ...
1
vote
2answers
50 views

Not a four-way handshake in Cisco Packet Tracer?

TCP connection termination is performed by the four-way handshake, as shown below (the image is taken from here). I tried to verify it on Cisco Packet Tracer. With the following topology, I captured ...
0
votes
0answers
33 views

Applying DSCP to an interface

I'm trying to apply DSCP (AF41) to an interface eth-trunk (if it matters) - [~HUAWEI] diffserv domain QoS \ creating diffserv domain named QoS [~HUAWEI] dsdomain QoS] ip-dscp-outbound af4 ...
0
votes
1answer
47 views

Cisco 3750: SNMP

On my Cisco 3750G, i have SNMPV3 enabled, this is working perfectly with Zabbix. I would like to separate production flows from supervision flows, Do you know if it's possible to enable SNMP ...
0
votes
1answer
24 views

Is it possible to query interface statistics bytes by given start time to end time in Juniper Device?

I can query a interface detail: admin@Juniper-EX# run show interfaces ge-0/0/1 detail Physical interface: ge-0/0/1, Enabled, Physical link is Down Interface index: 131, SNMP ifIndex: 504, ...
0
votes
0answers
20 views

CISCO Packet Tracer

Does Cisco Packet Tracer support config memory and config network command? If no, then do enterprise routers still support it?
0
votes
1answer
92 views

How does NAT ensure that every machine has a unique public IP?

I am trying to understand the distinction between public and private IP addresses in IPv4 networking. The picture I've been told has some problems with it, so I would like to present it here and ask ...
0
votes
0answers
11 views

How use the remaining adresses in this case? [duplicate]

I have this adress 201.217.5.0/24 and I made subnetting for a network of 5 servers so I use the adress /29 for that and I don't know if the remaining 248 adresses I can separate into /30 networks (...
0
votes
2answers
78 views

How BGP guarantees same route for a forwarded packet?

In BGP all routers choose the best route to a single destination. So for Router A and destination D, A will forward the packet to the next-hop router (let us say router R) after knowing the best route ...
0
votes
0answers
25 views

Dual FlexVPNs with VRFs on a single router

I'm trying to achieve a double wrapped VPN using a single router at both ends. (Tin foiled hat customer) My current chain of thought is HUB |global routing table >Internal VPN> VRF BLACK > ...
0
votes
1answer
40 views

AP won't join WLC

I have a lightweight AP AIR-AP3802I-E-K9 that I'm trying to connect to my WLC, but it just won't. When I run a debug on the WLC, I can see the Join request from my AP, and I can see my WLC sending a ...
1
vote
0answers
14 views

Some client can not able to get IP address [closed]

I get a new ASUS Router I have configured it as wireless router mode with IP address: 192.168.1.253 and disabled its DHCP server because there is a DHCP server with address: 192.168.1.1. Now some ...
-1
votes
1answer
36 views

How does a router settings page work? [closed]

When we enter the routers address 192.168.x.x into our browser we get a page containing the setting for the router. How does this page work ? Is the page stored in the router ?
1
vote
4answers
87 views

Why ICMP Destination Port Unreachable error messeage is generated for unreliable UDP packets?

My doubt is why an icmp destination port unreachable error message generated for udp. Why we can't simply discard the udp packet if the destination port is not reachable by saying udp is connection-...
0
votes
1answer
37 views

Suitable Laptops

Not sure if this topic or question has been asked before but if I was to buy a 2019 top spec macbook pro, would instill be able to connect to Cisco devices, I'll be running windows on it as well but ...
0
votes
2answers
38 views

How to connect to the console router with limited length of roll-over cable?

Here is the full question: I have a roll-over cable with length only 5 m and I want to connect it to the console of the cisco router that is 20 m far. How can I solve this?
1
vote
3answers
60 views

How to exclude interfaces without description on 'sh int description' command using regex?

[Cisco IOS-XE] [4507R+E] How to exclude interfaces without description on 'sh int description' command using regex? Couldn't find any related/previous questions.
0
votes
1answer
12 views

IP-Sec VPN Tunnel Established Between 2 Remote Machines. Why Can't Machines In Their Subnets Connect Across? [closed]

Have 2 Remote Ubuntu Machines in different subnets. one: 192.168.1.0/24 Two: 192.168.2.0/24 Established VPN tunnel between 2 machines, 1 in each subnet. Their IPs: Public IPs 1.1.1.1 2.2.2.2 ...
0
votes
1answer
42 views

UDP in wifi getting excessively buffered

We are using a wifi-enabled device that receives a stream of UDP packets (30 per second). It is very important for us to receive these messages without lag, that's why we are using UDP and not TCP ...

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