Networking Protocols

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Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

Hello Experts,

I am looking for feedback on this.

I have client that is expanding and the clients signed a contract for unmanaged wavelength from their data center on premise to the new site office ,  do you know what to expect exactly from the ISP.

The internet access will be from the data center.

Thanks,
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We have a single BGP published IP address range that has been provided by our ISP:

BGP Advertised Public IP Range: X.X.X.X/27
Local AS: TTTTTTTT
Remote (ISP) AS: ZZZZ
Local and Remote ASN is the same for both sites (single ISP only).

Under normal conditions, we need to all traffic going to X.X.X.X/27 to be directed to site A.
However, if site A is down, we need all traffic going to X.X.X.X/27 to be directed to site B.

If my reading of BGP is correct, we need to setup two parameters:

1) Local Preference - to handle outbound traffic flows.
2) AS-PATH - to handle inbound flows.

Is this correct? Or have I totally misunderstood what I've read about BGP.

Regards,
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I have  IOT devices reporting to a bunch of windows 2016 servers
Different sensors report to different server

our highest throughput server is dealing with about 70,000 sensor data records per min
One of our other server is doing about 16,000 and grinds to a halt and stops replying to tcp packets (i think)
The established netstat connections sky rockets to hundreds of thousands (when in fact there is only around 7,000 devices)
The server becomes very slow, and even dragging a window is very difficult and very slow
As soon as I stop the TCP importer process the server responds fine again, so we think we might not be acknowledging the tcp packets or some devices are misbehaving

We are trying to figure out where its going wrong, and was wondering are there any tools to see what is happening on the network
I've used wireshark and frankly i'm overwhelmed

I would like to see number of requests/responses per sec for each port as a summary as this may help us diagnose where its going wrong

Can anyone suggest some tools / things to try and help narrow in on the issue
0
Hi,

Every 3 minutes or so I get a message as per below when running ping out to Google on my home broadband of period of 1 hour:

I only have a tiny load on the network, I was playing a test video (1 hour) on my phone (in 1080p) so that I can see if it ever stops.

I also have a tiny camera monitoring my kids room.

I am trying to track down a bigger issue, as part of that I want to know if the below results are normal:

Now pinging Google

Pinging 8.8.8.8 with 32 bytes of data:
Request timed out.
Reply from 8.8.8.8: bytes=32 time=3257ms TTL=57
Reply from 8.8.8.8: bytes=32 time=3304ms TTL=57
Request timed out.

Ping statistics for 8.8.8.8:
    Packets: Sent = 4, Received = 2, Lost = 2 (50% loss),
Approximate round trip times in milli-seconds:
    Minimum = 3257ms, Maximum = 3304ms, Average = 3280ms
 
Thanks
0
We have an ASP.NET MVC applicaiton (Framework 4.5) deployed on IIS 8.0 on WINDOWS 2012 R2 Server. We got compliance issue from Security Team to Disable TLS 1.0 on this production server.
At present below settings are done on the server and it is verified using SSL LABs Test
SSL 2 : Disabled
SSL 3 : Disabled
TLS1.0: Enabled
TLS1.1: Disabled
TLS1.2: Enabled.

The application is working find with above settings. As soon as I disable TLS1.0 and perform server restart, the web application doesn't work and I get below error (also refer attached screenshot)
Can’t connect securely to this page
This might be because the site uses outdated or unsafe TLS security settings. If this keeps happening, try contacting the website’s owner.
Your TLS security settings aren’t set to the defaults, which could also be causing this error.


As soon as I revert back by Enabling TLS 1.0 the application seems to be working fine. Some how the application (or) the WIN 2012 server is using by default TLS1.0. How can change this to point to TLS 1.2.  So that the application works fine after disabling TLS 1.0

Below are few Troubleshooting I had performed and none of them worked.
1.  Added  below code at Action Result method of First Controller the application hits.
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; 

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2.  Tried by upgrading the application from Framework 4.5 to 4.6.2 and deployed to the server. …
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Hello ,

I would like some assistance ,maybe some example configs for multihoming BGP connection involving two local Cisco routers ,one ASN, /22 Public prefix with upstream again with two routers. I would like for local routers to do both load Balancing and redundancy. I am guessing will need to use OSPF between local routers for proper routing between them .I would suppose too that would need to make use of loopback interfaces instead of the physical interface address for both eBGP and iBGP. Please help.
0
I have two scenarios and just curious what happens in each:
first scenario, I have a client on switch A, switch B in the middle, and a destination network on switch C. VLAN 10 is tagged on port 25 and 26 on switch A. the client is connected to 25, and 26 connects to a port on switch B which is untagged on all ports. another port on switch B connects to port 25 on switch C which also tagged for VLAN 10. port 26 on switch C is tagged for VLAN 10 also and connects to the destination network. does switch B block the VLAN traffic? assume the switch is VLAN aware and all ports are untagged for VLAN 10 on switch B.

I’m asking because I have a complex network and I need to add a VLAN to isolate a guest network so the traffic originating in the core of our server room can carry the VLAN directly out to the Internet- the source here is a wireless network. let me know what you think!
0
We have a website that needs to be access by staff.  We have checked our Meraki firewall logs and also the Cisco Umbrella content filters to make sure nothing is being blocked, but the site is still inaccessible.  I ran a Wireshark capture and just see conintuous TCP Retransmission entries.  I am not familiar enough with Wireshark to analyze the capture and also running out of ideas on how to get this to work.

Any suggestions?

Wireshark Screenshot
0
Hi,

I have SSL VPN portal, Outlook Web Access, and several other web applications require to use port 443.

But I have only one static IP

How to function all of those services in port 443 with a single static IP?
0
One of Exchange server is showing down in cluster. I have checked the logs and found weird thing that server is trying to connect with other node on IPV6 of loop back interface ((169.254.6.180))

I have found very weird thing that the DR server is trying to make an connection IPV6 of loop back interface

cxl::ConnectWorker::operator (): (1460)' because of '[FTI][Follower] Aborting connection because NetFT route to (169.254.6.180) node on virtual IP fe80::74a6:2f16:1ea6:2cc5:~3343~ has failed to come up.
0
Hi,
I want to have one shared place to path of CentOs 7 machine, like the below. How?
\\113.255.213.124\tmp
0
Hi,

I'm getting unexpected volumes of traffic on my MPLS connection but it's only coming in one direction.  I have a number of sites on this MPLS and on two in particular I'm seeing larger than normal traffic.  One of these sites hold our ERP system, which gerenates a new KB of traffic but I'm seeing many MB coming down from the site (not going up).  I've ran a number of monitoring tools but am still unable to bottom out what this additional traffic is, I've now tried wireshark and can see quite a lot of 'TCP Previous segment not captured', 'TCP Out of Order', 'TCP Window Full', 'TCP Retransmission', 'TLSV1.2 TCP Previous Segment not captured', 'TCP Keep Alive'?  This is all coming from the ERP Site and I'm wondering if this is causing the additional traffic volume?

Cheers
0
I have a task that requires me to receive a RARP request with  MAC address and then to send out a RARP Response mapping that MAC to an IP. I understand the concepts behind RARP but am simply having an issue finding examples for building RARP packets in C#. I was wondering if anybody can point me in the right direction for building the actual packet.
0
There is windows server 2008 R2 server and had the application installed. Clients devices have mapped the network drive. Whenever the server goes into maintenance every week the next day users see red x on the network drive and then not able to access the application. They have to restart the computer for it to work. We tried setting up client and server and changed idle timeout not to disconnect but still shows red x.
0
While trying to apply a QoS outbound rule to a Catalyst 9300:

Invalid queuing class-map!!! Queuing actions supported only with dscp/cos/qos-group/precedence/exp based classification!!!

The config we are using is below:

policy-map Shoretel-Input-Policy
class class-shoretel-media-input
  set dscp ef
class class-shoretel-signaling-input
  set dscp cs3
class class-default
  set dscp default
policy-map Shoretel-Output-Policy
class class-shoretel-media-output
  set dscp ef
  priority level 1 percent 5
class class-shoretel-signaling-output
  set dscp cs3
  bandwidth remaining percent 15 
 class class-default
  set dscp default
  bandwidth remaining percent 60

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0
I was given public keys by vender , Im trying to connect to server through  WS _FTP utility .  I genertaed a set of keys using putty.  Im trying to import the private key that I created through Putty and receiving an error invalid format when trying to import  as my private keys through WS_FTP.

Thanks
Aron
0
Hi Experts,

I try to make a backup from my Nas Synology DS414slim to an non-Synology nas  (ZyXel NSA320S), but I can't find software that can do that job.
Synlogy has Hyper-backup, but that needs installation on both sides (Synology => Synology) so I can't use that.
Other software on the Synology are cloudisch or dropboxisch solutions, what is overdone, because they are in the same room on the same network.

On this moment I running a copy from 1 share to an other, but that takes to long (oveer 24 hours) and I can't shutdown my PC while the copy is running.
So I need backup software on my Synology, that can save to a shere on the ZyXel,
or software on the ZyXel that can pull the data from a Synology share.

So Nas => Nas
not Nas => PC => Nas


Thanks !!!
0
Hi guys,
I got a Meraki mx64 router - has 3 vlans-1,2,5
Vlan 1,2 - server is dhcp
Vlan5- meraki is dhcp

Meraki connecting to dlink dgs1510 switch1(vlan1 -untag,vlan 2-tag, vlan5-tag) , and Sameway switch1 connecting to switch2 in trunk(vlan1-untag,vlan 2-yah, vlan5-tag)

In switch1- all ports are vlan1 untag and vlan2 tag, as it’s going to phones and computers. Vlan5 not a member

In switch2- all ports connecting to computers which needs to be in different subnet from rest, so vlan5 untag In all ports. Vlan1&2 not members

If I do this setup - vlan 5untag in switch 2 not working. It’s not communicating to router to get dhcp. In trunk between switches vlan5 is tagged, but all ports in switch 2 , is untag.  So am little confused.
Am I doing anything wrong ? I have also attached a diagram to make it easier

[embed=file 1411870]
[embed=doc 1411870]
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Hi,
The folder is shared properly and why can't I refer to it like

\\182.173.77.208\shr2
0
i have windows 2016 server
I have data coming in on port 3299
When i hits the server i need to remap it to port 9013 as there is an app on this server which is listening on this port

is this possible/
There is not router, the server sits directly on the internet so it needs to be done it windows
0
Hello,

If I am running a tcp ping tool on a virtual windows server that is hosting my website also, would it be possible to use the tcp ping tool to ping the visitor of my website to record the latency/round trip time without the stateful firewall blocking it?

The issues I came up with would be that all/most home-based firewalls are stateful firewalls, tcp communication can use only one IP and one port(if I am correct?) per application (website in this scenario). So I would have to have the tcp ping application listen in on the port using another IP, or open a new port (and IP) to communicate with the same website user. So my second question would be: would the stateful firewall block this communication since it is from a different port and/or IP even though it's on the same web server?
0
Run connection test "telnet port 53" failed, is the 23 or 53 port connection issue? How to verify?
0
I am having issues in a MPLS VPNv4 BGP setup where the CE is not receiving any BGP routes from the PE.

PE2 Cisco BGP config:
router bgp 1
 bgp log-neighbor-changes
 neighbor 1.1.1.1 remote-as 1
 neighbor 1.1.1.1 update-source Loopback0
 !
 address-family vpnv4
  neighbor 1.1.1.1 activate
  neighbor 1.1.1.1 send-community both
 exit-address-family
 !
 address-family ipv4 vrf CUST-1
  neighbor 10.10.20.2 remote-as 200
  neighbor 10.10.20.2 activate
 exit-address-family
!

CE2 Cisco BGP config:
router bgp 200
 bgp log-neighbor-changes
 redistribute connected
 neighbor 10.10.20.1 remote-as 1
 neighbor 10.10.20.1 soft-reconfiguration inbound
!

If you need more info please let me know (I can attach the full config if you want).
CE2_startup-config.cfg
PE2_startup-config.cfg
0
Hi

Please help me to change the time on my OXE WBM switchboard
0
Regedit \ RouterManager can be configured ?

Regedit \ TCPip6 every modified would be return to previous state, as motherboard changed, DUID mac info inside needed to , RFC3315 required .

When the OEM vga driver latest supported driver updated to Nov. 2018, whatever way tried, the computer Driver Manager can not see the latest date of the offering ?
0

Networking Protocols

12K

Solutions

16K

Contributors

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.