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32 views

Can you use the first and last subnet in IPv4? [duplicate]

I know you can't use the first and last address -in- a subnet. (I.E. 192.168.1.0 or 192.168.1.255) but there is some amount of disagreement in my Networking 1 class whether or not you can use the ...
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2answers
37 views

How To Route Private Subnet Traffic To Internet Via Public Subnet In The Same AWS VPC?

This scenario is simple, created a VPC (CIDR > 172.16.0.0/16) in AWS Management Console, created 2 subnets in it. Public (CIDR > 172.16.1.0/24) Private (CIDR > 172.16.2.0/24) Public route is set on ...
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1answer
44 views

Is this device a network hub? [closed]

Due to the space limitation of the conduit, I ran a single cable from the switch to my room, and intended to run 2 separate fast Ethernet lines on it (4 wires each). I bought this thing from China for ...
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0answers
18 views

why we need to make the size of our burst 2 times the product of bandwidth and delay?

I'm new to Networking and I'm reading a textbook which says: The bandwidth-delay product defines the number of bits that can fill the link. This measurement is important if we need to send data in ...
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2answers
39 views

Cisco ASA IKE Receiver: Runt ISAKMP packet discarded on Port 500

I have lots of ikev1 tunnel running on our production Cisco ASA5585 and today i have configured ikev2 tunnel for one of our new customer and i have started seeing following error, and not sure what is ...
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0answers
20 views

IKE Main Mode - Dynamic peers

So i searched for some time now, read the https://tools.ietf.org/html/rfc2409RFC and simply couldn't find an answer to why Main Mode needs static adresses. The RFC states Aggressive Mode does not ...
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0answers
12 views

Cisco ASA Security Warning: Untrusted server cert after asa crash and reload

We have Cisco ASA 5505 working VPN anyconnect and it's been almost 1 year no issue, but last week it got crashed and reboot itself and after that we found it started throwing warning like following: ...
0
votes
1answer
35 views

152 bit hardware address in dhcp binding?

When listing MAC addresses on a Cisco ISR DHCP service, I get a long list of hardware addresses, one per IP address, but for one IP I get an address so long it runs onto three lines. The other ...
0
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1answer
24 views

STP Priority field and 4 bits in multiples of 4096

For the STP Priority Field, how do you get "multiples of 4096" out of 4 bits?
1
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1answer
37 views

what are Hardware size and protocol size in ARP header? Attached image

While working on packet capture for a simple scan, just had a look at packet capture and want to know what does hardware size and protocol size means in a ARP header?
2
votes
2answers
61 views

Troubleshooting connectivity in BGP/Quagga/Docker lab

I have created a virtual networking lab to test BGP routing. The lab is made up of two Debian Docker images which serve as end users and two images running Alpine Linux with Quagga to serve as the ...
0
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1answer
40 views

How to create a routing loop? [closed]

Let's say I have two or three routers and I want the packets sent between them NOT to reach their destination but to "loop" between the routers until TTL runs out." I need to do this in a network ...
0
votes
1answer
67 views

Junos, accidentally deleted a FIB entry, how to re-add?

while i was testing Junos in a virtual environment, i accidentally deleted an entry in the forwarding base (do not clearly remember which command i used to let that happen), but because of this the ...
0
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0answers
20 views

How Actually OSI model works?? I have numerous doubts in that which i mentioned below. Can anyone address those questions in simple way? [duplicate]

Acc. to my understanding i have few doubts first comes..sender like me who opens IE or Chrome to access a website then i write https://example.com Here i am using internet service using some ...
0
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2answers
30 views

Traceroute command last hop cannot be reached

By running the traceroute command below I obtained this output: traceroute www.google.com -q 3 -m 60 traceroute to www.google.com (172.217.169.36), 60 hops max, 60 byte packets 1 gateway (10.81.62....
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1answer
41 views

How is port 80 associated with application port?

I'm new to networking, just a question on port numbers. We know that port 80 is for HTTP. But if I want to access a web application whose web server handles http requests, normally I type below url ...
0
votes
1answer
27 views

When IP header of length 22bytes is there then how padding will work?

My base IPv4 header of 20bytes + 2bytes i used for Options making it 22bytes means 176bits so padding will add 16 Zeroes to make it multiple of 32? is this correct way to understand? Boundary of ...
0
votes
1answer
31 views

Functionality differences between an Wireless Access Point and a Switch?

I have a WAP connected to a switch via a twisted pair cable. Aside from the communication medium to other nodes (electrical signal vs radio waves), do they operate the same way? Specifically: When ...
-1
votes
1answer
23 views

Patch Panel/Wiring Question

The reason I am asking this is because I am an amateur, so if it is obvious to you, it's not to me, so please explain. I saw this picture and I panicked a little bit, First of all I know older patch ...
0
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2answers
85 views

what is difference between MSS and Window Size?

What is actual difference b/w these two? 1) I have gone through many tutorials on Youtube where some have told that Window Size is what total packet size it can receive eg Window Size is 15000 bytes ...
2
votes
0answers
25 views

First fresnel zone and Epstein-Peterson approach

Let's say we have the following wireless communication system with obstacles located as drawn in this picture Solving this using Bullington method is straight-forward, only obstacles that fall into ...
0
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1answer
22 views

Question On Route Aggregation [duplicate]

Suppose I have these 3 IP Prefixes : 190.154.27.0/26 190.154.27.64/26 190.154.27.192/26 and I want find the aggregate prefix. I convert each address to its' binary equivalent: 10111110....
0
votes
1answer
10 views

Parameter Map vs IP SLA

What is the difference between parameter map and ip sla? In both we can specify that if threshold of something is crossed then a log is generated and based on that some action can be taken. Has one ...
1
vote
2answers
38 views

problems routing WAN with private IPs and LAN with public IPs

I have just installed pfsense 2.4 for a SOHO I work and I'm getting problems with the routing. I have asked my ISP for a /29 network with public ips for the DMZ, but instead of giving my directly what ...
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0answers
24 views

Possible to change VTY password 7 to secret 9

The version I have Router1#sh ver Cisco IOS XE Software, Version 16.09.02 . Router1#sh run | sec vty line vty 0 4 password 7 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX login authentication ...
0
votes
1answer
16 views

HP 5800 interface card/module installation

Is it possible to install an interface card, in this case LSW1GP16P0 to a HP 5800(JC103A) without powering off the switch? The installation guide is not very clear on that point.
0
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2answers
74 views

What happens to undetected Ethernet errors?

The checksum used in Ethernet packets cannot 100% detect errors. If that is the case, how can I ensure that some file I have transferred from one computer to another is uncorrupted? Thanks
0
votes
2answers
64 views

How does a router route traffic on a LAN, in detail?

Electrical engineer here trying to understand things. So I guess this might be simple or very complex, but how exactly does a router route traffic between say 2 PCs that are on a LAN? eg. PC-1 and PC-...
1
vote
2answers
59 views

Different Wi-Fi security levels under same private subnet

I'm working on an assignment and I'm given a hypothetical scenario where: A company has a local subnet where everything shares the flat address space 192.168.0.0/8 (this means that any device can ...
2
votes
1answer
65 views

Is TR-069 a security risk?

My ISP provides a combo box (ONT + router + switch + Wi-Fi) which they can manage remotely, likely using TR-069. They automatically push default configurations to the device. After I do a factory ...
0
votes
1answer
28 views

implementing broadcast traffic restriction

Can we restrict the high broadcast traffic from interface in Cisco ASR9k and 7600 routers? If so, what configuration we should apply?
0
votes
0answers
29 views

Which Ethernet Ring Protection Switching (ERPS) feature makes it so faster than RSTP/MSTP?

I want to know what makes it possible for ERPS to converge under 50 ms? it's a hardware-specific feature that provides this fast convergence or it is about the much more efficient algorithm? I read ...
0
votes
1answer
29 views

Brocade/Ruckus per vlan spanning tree vs Cisco

Brocade = (config-vlan-10)#spanning-tree rstp This seems to enable rstp per vlan. This example enabling it on vlan 10. Cisco = spanning-tree mode rapid-pvst This enables Rapid PVST+ under the covers ...
0
votes
0answers
37 views

How to change a usernames password to secret without deleting username

Router1(config)#username admin privilege 15 algorithm-type scrypt secret xxxxxxxxxxxxxx ERROR: Can not have both a user password and a user secret. Please choose one or the other. Router1(config)# I ...
0
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2answers
30 views

SFP/SFP+: Extender? F/F panel passthrough?

My primary question is this: Is it possible to have a simple passive SFP/SFP+ bulkhead passthrough connector, with two female SFP/SFP+ sockets facing opposite directions and wired directly together, ...
0
votes
0answers
8 views

RTO timer in EIGRP

Does EIGRP function like this - A packet is sent and the sender waits for acknowledgement. If it gets an acknowledgment, then it updates SRTT timer along with Sequence Number. If it doesn’t get any ...
0
votes
1answer
33 views

Routing between 2 VLANs with one HP Switch

I need help with VLAN: I have a WiFi AP with the IP 192.168.100.190. There are 2 SSIDs with VLAN 1 and 2 created. As a router I have a Sophos UTM with the IP 192.168.100.199. Furthermore, I have an ...
1
vote
2answers
42 views

SRX to ASA IPSec troubles

we built a VPN between partner's Cisco ASA (unknown version) and my Juniper SRX 340. The tunnel seems to go up properly: root@fw01> show security ike security-associations node0: ----------------...
0
votes
0answers
19 views

Adding legacy AP firmware to new WLC

At work I've stumbled into this task where I needed to update our virtual WLC from 8.1.133 to 8.10.2.2. However in addition to new APs (9120) there are still APs (2702) in use that are not supported ...
0
votes
1answer
34 views

Cisco qos, service-policy on output interface on 1100 ISR seems ignored

I am trying to configure QoS for a specialty purpose application, and it is the first time I have done QoS. This is on an 1100 ISR with IOS XE 16.09.03. The device is a set of 4 that establish a mesh ...
0
votes
1answer
22 views

Strict source routing using my own scattered PCs/ routers

I would like to completely control my network transportation by defining the packages path. According to this I can't do it unless I have control over all the PCs/ routers in its way. Suppose, I can ...
0
votes
3answers
65 views

Difference between Port (all VLANs allowed) and Trunk

I have a very basic background on networking Cisco (2960 switch), and realize that Fortiswitch 224E has the option to allow many VLANs in a port: On the other hand, is the trunk (which I assume is ...
0
votes
1answer
56 views

Nexus 6001 How to find source of STM_LEARNING_OVERLOAD

Several time ago I've foud that NX-OS sends STM_LEARNING_OVERLOAD EET: %FWM-4-STM_LEARNING_OVERLOAD: system experiencing unusual number of new address notifications - deferring learn notification for ...
0
votes
1answer
19 views

Why do we need EIGRP AS numbers when we have EIGRP RID?

I understand that the EIGRP routers need to have the same AS number to peer with each other. But why can't we just use EIGRP Router ID?
0
votes
1answer
35 views

vpc/mlag block half of uplink?

We want to configure 2 Arista switches by mlag and connect 1 port channeled switch to both of arista's. so in this case, if one of our arista fail the other one will respond. now my question here is ...
0
votes
0answers
12 views

Cisco 7960 CTL File Encoding

When booting my 7960 phone, I am getting all of the correct files. However, in trust list (CTL File), the IP addresses are incorrect. They are the ASCII characters of the actual IP address. Therefore, ...
0
votes
1answer
24 views

SFP LC to LC path code recommendation [closed]

I need to connect to Ubiquiti (router > Switch) using SFP. I believe I need a Ubiquiti Networks UF-SM-1G-S transmitter (BiDi). the cable will be around 40M long and crossing the house, underneath ...
1
vote
1answer
48 views

How does a DNS response reach a client behind a NAT?

How does a DNS response reach a client behind a NAT? I'm talking about DNS queries using UDP for transport with a server that is not in the same network as the client. Does the NAT correlate the ...
0
votes
4answers
41 views

ACL on routers to block TCP/UDP ports

How routers understand the layer 4 port numbers to be blocked in ACL? When an ACL to block TCP/UDP traffic with certain port numbers is applied on a router/L3 interface , how will router understand ...
0
votes
1answer
116 views

How to Run Static IP Through Comcast Business Class Modem to Router?

I apologize in advance for this kind of nebulous question, but I'm very stuck after many hours of trying and I need help. Here's what I have: Newest model of the Comcast Business Class Modem/Router ...

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