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.

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I have cisco catalyst 4507R-E that has to be replaced with below:
1. New Cisco catalyst 9407R switch with 2 supervisor modules, 1 24 sfp+ port module and 1 48 1Gig UPOE ports.

What are the recommended steps or the best way to migrate from 4507R-E to 9407R.
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Port 5083 : Qpur File Protocol
Can somebody tell me for what purpose is this service used for?
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Can someone explain to me where consensus algorithms fit within the TCP/IP model?  Let use Raft as an example.  Does it use multicast?  Does it use it's own transport number or TCP/UDP?  Does it live on the application layer?

Thanks
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Up to now, we have been running a fairly large peer-to-peer network of almost 100% Windows 10 Pro workstations with ONLY IPv4 enabled on the workstation NICs.  (There are 3 interconnected subnets with no name service shared between them).  Disabling IPv6 was done historically because using IPv6 in addition to IPv4 caused problems.  

Yet, more often now, Experts advise enabling IPv6.  Going along seemed perhaps a good idea.  And, in the sense of "if it ain't broke don't fix it", the hoped-for fix was to fix the Network list of computers in each distinct subnet - which has become more flaky/unreliable.  The experience with this was mixed as not all computers were switched to IPv6; i.e. not all subnets' workstations had IPv6 enabled.

We have since solved the Network computer name list problem.  So, there's a decision to make:
- "if it ain't broke, don't fix it" says to leave only IPv4 enabled.
- Expert advice says to also enable IPv6.  

It surely appears that "IPV6" in Windows is NOT simply an addressing scheme but also carries with it other things - things which I'm unable to list, but one hopes.

I have not had any trouble that I know of in enabling IPv6.  Yet, when one of the senior folks enables it on his own workstation, the network connectivity dies.  This problem survives a reboot and, yes, IPv4 remains enabled.

I believe it's bad practice to have a mix of settings in a network.  So if someone can suggest a fix to the network connectivity problem
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when I do a pptp VPN from my network over an ATT router I get this error only on my windows 10 devices (1 desktop and 2 laptops) via WiFi and via Hardline. my 1 win7 desktop has no issues and when I put the win10 devices on a different network (my hotspot) the VPN goes through with no issues. any ideas?

I've already tried disabling the win10 stations local firewall and that did not help.
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I am sysadmin..I want to know

I want to reach the server, to check the connectivity thru specific port.
This is just to varify whether the required firewall rule defined properly or not.
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Consider the below scenario

userPC---- firewall --- Destination-server
                         10.1.1.1


I have installed some software on the server, the service  of that software is using port # 301.

1) Scenario...
      Firewall defined
      server#  service UP
        userPC# telnet 10.1.1.1 301  --> user get reply

2)Scenario...
      Firewall defined
      server# service DOWN

is there any command/3rdparty-tools available to just varify, pockets from userPC able to reach on the server through port#301

==
This I asked just to segregate if there any issue, problem from firewall side (or) destination server side.
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Milestone XProtect Management software.  How can I setup SNMP to monitor cameras and alert me when a camera is off line.
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Hi ..CCan anyone tell me what is this service "icl-twobase1" running on port 25000 ?
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I am trying to run an inventory on our servers. All I get in return are DCOM errors in event logs. I speculate the firewalls are blocking traffic but I cannot see anything helpful in Wireshark. I thought that telnet over 135 would fail but does not. Also ICMP is not blocked or I would not be able to ping the servers

Event Viewer
DCOM was unable to communicate with the computer XXXXXX using any of the configured protocols; requested by PID     2780 (C:\Windows\SysWOW64\cscript.EXE), while activating CLSID {8BC3F05E-D86B-11D0-A075-00C04FB68820}.


I have attached the Wireshark capture
pac.pcapng
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I'd like to redistribute eigrp into bgp on the Nexus 7009. I'd also like to set the correct metric. From my understanding, I have to use route map. I did some research and could not find any good info. Any helps will be greatly appreciated.
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Using Linux ES 6  Unable to get SSHD to stay started.      Using        service sshd start     or   restart   starts it but it goes right back to being stopped.

any thoughts?
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Hi... Can anyone tell me what is this Simple Network Audio Protocol running on port 4752 ? Thanks
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Hi.. This is regarding networking port no. 2829, 2832, 2831 and 2830. According to IANA website, this is something silkp1, silkp2, silkp3 and silkp4. Can anyone tell me what is this silkp ?
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Cisco 3750G switches, with high FCS errors.  I've been having a problem where a link between two switches just dies, and sometimes, it comes back by itself, maybe 30 min or an hour later.  Most of the time, I have to manually move the cable to another port, to get it to come back up, even a reboot of the switch doesn't do the trick.
I have already replaced one of the switches, but the problem persists. I have looked at the logs, and nothing there stands out, most of the errors just state the port went down or came back up.  I started looking at the fcs errors, and I noticed that especially on one switch, it's a really high number.
I have attached the screenshots, any idea's what can be causing this?  I would like to replace the cable, but I don't have another cable and it's a large task to install another one., as the distance traverses a different building. I am not using port security.  Both sides of the link are trunk ports.

I tried to clear the counters and controllers, but the commands I have tried are not working.   Any ideas what could be causing the high fcs errors and what the exact commands are for clearing both the counters, I viewed a few Cisco sights, but they didn't work.

.38
.39
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Hi i am looking for the service related to network port number 11000. According to IANA website, service name is IRISA. Can somebody tell me what this IRISA mean ? Thanks.
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Hi Need to upgrade the firmware of an Aruba 2530 48G PoE+ Switch

The switch is in our remote office. I'm trying to set my laptop up as a TFTP server and connect to its public IP address over port 2222. It fails to upload the software.

Any idea please
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Wired users getting 192.168.1.x IP address.  Instead of 10.10.x.x
Not sure what happened.   Not all the users tho.  Any ideas?
ipconfig /renew /release not helping.  
Need some help troubleshooting.
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VMware vCenter 5.5 web login  coming Empty inventory Error reflecting is : "Could not connect to one or more vCenter Server systems: https://xxx.xxx.xxx.xxx:443/sdk"

VC 5.5 is running on windows 2008 and database is Sql2008  running on other server [both are vm running on esxi same host]
Telnet is Fine
DB Test is Fine
Services are fine
But Noting visible under vc inventory.
Did Server reboot and issue got fixed but repeated again after 4 days.

Pls help to locate if issue is with Network/DB/SSL or VC itself


Not able to locate much detail to apply appropriate fix
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-7057366E756B0F4D.jpg
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I have installed IP Cameras on 5 different locations in the US and I want to watch all those IP cameras in India, but the Ping Test gives me this result after having a 100 Mbps connection -> bytes= 32 time= 579 TTL=117. Because of which I am unable to watch the live view smoothly. It gets freeze after every other 2 Seconds.
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We have a client who has just had installed a BTNet Leased line installed.
They have 8 static (5 usable) IP address on the line (/29 subnet) assigned. Lets say this is 122.122.122.0/29
We have configured the WAN1 of the Draytek with this range and configured the WAN IP address as 122.122.122.2, subnet 255.255.255.248 and its Gateway to point to 122.122.122.1

Connected a PC to the LAN1 and LAN2 Ports on the Draytek which allows us to access the Internet OK - All Works OK from LAN to WAN.

We are now trying to Port Forward specific ports (lets say 22 and 23 - SSH and Telnet) on the next useable IP address (122.122.122.3) through to a device on LAN2 which has been configured on a different LAN/Local Subnet (192.168.2.0/24). The device is on an IP address of 192.168.2.2, LAN2 IP on Draytek is 192.168.2.1

The Draytek can ping to the device with an IP of 192.168.2.2 but we cannot seem to get the NAT/Port forwarding to work correctly.

We have tried using One to One NAT for this solution along with a Firewall rule to allow WAN to LAN2 traffic for these ports. Logging (SYSLOG) is turned on for this rule but no traffic is ever reaching the firewall rule as no logs are produced.

To see if we had set something up wrong we have also tried port forwarding these ports on the first WAN1 IP address of say 122.122.122.2 but again nothing is logged with SYSLOGS

This is the first time we have tried configuring a Draytek, usually use Zyxel firewalls without any issues so I was …
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Dear Experts

to setup new office what IP addressing is recommended as it is common to use 192.168.1.0/24 but I would like to go for something different and this network will have to be get connected over the VPN from other location and they may be using 19.168.1.0/24,  this new network yet to be setup will have internal dns and dhcp and leased line and mpls connectivity. the total users or end devices within this network will not be more than 75, I prefer other than 192.168.1.0/24 is there a recommend/best  practice in selecting a particular ip addressing for private lan network please suggest,  is it good to go with 192.168.0.1/24 or something like 192.168.100.0/24 or any other ip addressing recommended please suggest.
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If you have two Internet feeds with BGP attracting traffic to your site and one goes out - should that interfere with ongoing uploads?
Say I had 200 uploads via sftp to my site. Provider A does some maintenance but Provider B stays up. Traffic load drops to 50
uploads. Since the connections are TCP/SFTP I would think they would just pause and then continue once the available path became
available. Or is it the case that the reconvergence/hold down timers are likely just too long to keep most of those conversations
alive?
0
I had to tackle a challenge to use Cradlepoint routers to provide backup WAN connectivity for my remote sites. This is how I did it.
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GLBP Configuration


gl
I have configured GLBP on R3,R4,R5 shown in the topology above.
I would like to know why,in the output below, the Standby Router is showing the R5 instead of R4 , they have the default priority. I wonder if the Highest Mac address factors in the election if Standby Router.
another thing that I want to understand is the keyword "Preempt" in the configuration routers that are not AVG.
I know that Priority will determine which router will be the AVG now and which router will take over as AVG if the current AVG is down, but the keyword "Preempt" is still not clear to me when it should factor in




R3#sh run | sec glbp
 glbp 1 ip 192.168.1.254
 glbp 1 priority 150
 glbp 1 preempt
R3#

Open in new window


R4#sh run | sec glbp
 glbp 1 ip 192.168.1.254
 glbp 1 preempt
R4#

Open in new window


R5#sh run | sec glbp
 glbp 1 ip 192.168.1.254
R5#


R3#sh glbp brief    
Interface   Grp  Fwd Pri State    Address         Active router   Standby router
Gi0/0       1    -   150 Active   192.168.1.254   local           192.168.1.15
Gi0/0       1    1   -   Active   0007.b400.0101  local           -
Gi0/0       1    2   -   Listen   0007.b400.0102  192.168.1.14    -
Gi0/0       1    3   -   Listen   0007.b400.0103  192.168.1.15    -
R3#

Open in new window


*** another issue that I cannot figure out  the cause is the Traceroute from Hosts. if it goes through R3( the AVG) , it will make it to R2, but when Traceroute goes through R4 or R5 it displays the Exclamation Mark with H letter, as shown below:

Host#traceroute 192.168.23.2

Type escape sequence to abort.
Tracing the route to 192.168.23.2

  1 192.168.1.15 12 msec 12 msec 12 msec
  2 192.168.1.15 !H  !H  !H
Host#clear arp              
Host#traceroute 192.168.23.2

Type escape sequence to abort.
Tracing the route to 192.168.23.2

  1 192.168.1.13 1016 msec 12 msec 8 msec
  2 192.168.23.2 44 msec 20 msec 24 msec
Host#
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Networking Protocols

11K

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.