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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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My server admin is asking of me to open up 1000 ports for a server to run passive FTP. Is there any other way to have passive FTP without opening up all those ports?
What concerns should I be aware of security wise in doing this?
0
Nothing ever in the clear!
LVL 1
Nothing ever in the clear!

This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.

What are some good VPN software or services that will allow me to use the same external IP address every time and also change to different external IP addresses around the world whenever I need to?

I need to be able to use this both within Windows 10 and the latest Mac OS X software.
0
Hello I have a digital signage software server to remote led screens ..its   a web sever run on port   777  and 5222 it was work fine for few months my puplic ip was started by .195.xxx.xx.xx but now  it's stop i cant ping my pulic ip and all the ports is closed when I checked them by can you see me . Com now my public ip start by 63.xx.xx.xx what I can do to run the server again


Thank you
0
We have AT&T MIS 10Gbps Ethernet circuit with speed throttled to 2Gbps. We have 10Gbps fiber connection from AT&T router to our fortinet firewall 600D 10G port. Is their a way to test internet speed over 1Gbps? We don't have any device or NIC with more than 1 Gig. How to test it?
0
Hello,

Two days ago I tried to print a PDF file to a networked printer and nothing happened.  It is like the printer disappeared.  I did some digging and found a new error in Device Manager - my Microsoft Teredo Tunneling Adapter had a yellow exclamation that said the device cannot start (Code 10).  

I tried disabling and re-enabling the adapter, no luck.  I did the same for my physical NICs on my PC and no luck.  I was able to get my printer to work, but now a screen capture utility called SnagIt 9 no longer displays the library of my screen captures (many thousands).

Here is info on my system:

Windows 7 Pro 64-bit
Up to date with Microsoft updates
Have three physical network interface cards in the PC, two are disabled - only one used
For all three cards, IP4 and IP6 are checked

I tried having Device Manager check for driver updates, and was told I have the latest version.  I also uninstalled the adapter and re-installed it, but I still have this error message.  Any suggestions?
0
I am using file Zilla to connect an ftp server but unfortunately unable to do so below is the error

Status:      Resolving address of ftp2.churchs.com
06:38:14      Status:      Connecting to 209.208.247.23:21...
06:38:14      Status:      Connection established, waiting for welcome message...
06:38:15      Status:      Insecure server, it does not support FTP over TLS.
06:38:15      Status:      Logged in
06:38:15      Status:      Retrieving directory listing...
06:38:34      Command:      PWD
06:38:34      Response:      257 "/CFC-Analytics" is current directory.
06:38:34      Command:      TYPE I
06:38:34      Response:      200 Type set to I.
06:38:34      Command:      PORT 10,139,105,11,209,15
06:38:34      Error:      Disconnected from server: ECONNABORTED - Connection aborted
06:38:34      Error:      Failed to retrieve directory listing
0
show ip pim nei
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      P - Proxy Capable, S - State Refresh Capable, G - GenID Capable


Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                                                                 Prio/Mode
10.0.0.193        TenGigabitEthernet1/2    11w1d/00:01:29    v2    1 / S P G
10.0.0.209        TenGigabitEthernet3/1    11w0d/00:01:41    v2    1 / S P G
10.0.16.13        TenGigabitEthernet4/7    11w2d/00:01:25    v2    1 / G
10.0.16.9         TenGigabitEthernet4/8    11w2d/00:01:27    v2    1 / G


What does it mean when I only have the G in the mode column?

The link at 4/7 and 4/8 is eBGP peer.
0
I am using this Arris NVG443 router in conjunction with an Obitalk 200 to use internet (DSL)  VOIP to make and receive phone calls. The problem is no matter what service I use ie. Google voice (free), Onesuite (subscription),  ALL calls made and received drop within minutes. Using Onesuite provider  all calls drop at exactly 9 minutes every time. Obitalk support says to configure my router to this:
In order for your OBi to be able to send packets w/o interruption, please configure your router as follows:

Allow Outgoing:
TCP Ports: 6800, 5222, 5223
UDP Ports: 5060, 5061, 10000 to 11000, 16600 to 16998, 19305
Allow Incoming on UDP Port: 10000

Problem is: There is nowhere to enter all these ports? Just one range.
 Router has port forwarding and port triggering . In port forwarding there is only a global port range  one port # to another port #, and one base port.
In port triggering there is just a trigger range same as above, one port to one port, and one open port range same as above.

Not sure what to enter into router and can't seem to find any answers ?
0
Hi, I want to open connection from RHEL to FTPS server, receive "Fatal error: gnutls_handshake: A TLS packet with unexpected length was received" error when start to transfer file to the FTPS server.

Any idea?

 lftp -v
LFTP | Version 4.0.9 | Copyright (c) 1996-2010 Alexander V. Lukyanov

LFTP is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with LFTP.  If not, see <http://www.gnu.org/licenses/>.

Send bug reports and questions to the mailing list <lftp@uniyar.ac.ru>.

Libraries used: Readline 6.0


FileCopy(0xbcd2c0) enters state INITIAL
FileCopy(0xbcd2c0) enters state DO_COPY
---- dns cache hit
---- Connecting to x.com (10.0.0.1) port 21
copy: get hit eof
copy: waiting for put confirmation
FileCopy(0xbcd2c0) enters state CONFIRM_WAIT
GNUTLS: HSK[0xbfc2c0]: Keeping ciphersuite: DHE_RSA_AES_128_CBC_SHA1
GNUTLS: HSK[0xbfc2c0]: Keeping ciphersuite: DHE_RSA_CAMELLIA_128_CBC_SHA1
GNUTLS: HSK[0xbfc2c0]: Keeping ciphersuite: DHE_RSA_AES_256_CBC_SHA1
GNUTLS: HSK[0xbfc2c0]: 

Open in new window

0
Hello Experts,
Please suggest how to configure Precision Time Protocol (PTP) client with Mellanox (driver: mlx4_en, version: 4.1-1.0.2 (27 Jun 2017), firmware-version: 2.40.7000) on Centos 6.8 64bit system.
0
Prepare for your VMware VCP6-DCV exam.
LVL 1
Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

Hi All,

Could you all help with this config I'd like to implement OSPF ?& if this is the correct configuration to implement?



MAN(config-if)# ip address 10.10.12.13 255.255.255.0
MAN(config-if)# no shut

BEL(config-if)# ip address 10.10.12.12 255.255.255.0
BEL(config-if)# no shut

2. The routing OSPF between routers:
MAN(config)# router OSPF 1
MAN(config-router)# network 10.10.14.0 0.0.0.255 a 0
MAN(config-router)# network 10.10.12.0 0.0.0.255 a 0
MAN(config-router)# network 10.200.3.0 0.0.0.255 a 0

BEL(config)# router OSPF 1
BEL(config-router)# network 10.10.120 0.0.0.255 a 0
BEL(config-router)# network 10.10.11.0 0.0.0.255 a 0
BEL(config-router)# network 10.202.3.0 0.0.0.255 a 0

LON(config)# router OSPF 1
LON(config-router)# network 10.10.0.0 0.0.0.255 a 0
LON(config-router)# network 10.10.0.0 0.0.0.255 a 0
LON(config-router)# network 10.0.3.0 0.0.0.255 a 0

BATH(config)# router OSPF 1
BATH(config-router)# network 10.0.14.0 0.0.0.255 a 0
BATH(config-router)# network 10.0.10.0 0.0.0.255 a 0
BATH(config-router)# network 10.0.3.0 0.0.0.255 a 0
OSPF-NEW.PNG
0
Hello, I have Windows 10 and Windows 7 systems  in a SBS2011 domain environment and at least once a day the windows explorer freezes and I have to reboot. After selecting reboot it hangs at reboot mode. I have to force it to shutdown and and start it again for it to work.  Most of the time windows explorer does not work and also internet access goes away too. I even can not access the C-Drive and the Network Drives. Nothing at all.  I have Symantec Endpoint and Malware Byte endpoint protection installed on these systems. Please help.

Thank you
0
I need to see the DNS resolution requests of my applications audited and if necessary modified before being sent. I suppose the easiest would be a local resolver that would review my requests before forwarding them to the resolver of my ISP? Another way would be to monitor and be able to override UDP/53 traffi (something I have no clue about). Is there an open source I could use?
Also, I would need this on all OS.
How would you do that? Or would there be a free solution that exists?
Need: support of iDNs as per RFC 5895 for the wole machine (transparent to applications), management of variants, parental control, typos correction. Etc.
Thank you!
0
Hi,

Bit of an odd one, I have set the correct NTP servers up on the config of a yealink T23G phone, having run a pcap I can see that it's dns queries to the NTP server are being refused. The phones are on a segmented VLAN network, as far as I know other handsets on different VLANs are not having this problem and there is nothing unique about how this is set up compared to others.

I have tried upgrading the firmware and different NTP time servers. This is affecting multiple handsets

The message I'm seeing a lot in the capture is that "The Server is not an authority for the domain"

I've attached a sample of the queries I'm seeing in the PCAP.

Any ideas guys?

Many thanks,
Tim
0
Hi !

Is there any way to force the HSRP election process ? I want to change the Standby router to become Active. I am changing the priority value but it s not falling over to the other device.
1
Hi All,
I have been at this all day to no avail.
I am using Yealink IP Phones. The customer now wants to run his laptops with the phones. So the PC's run through the phones.
The phones use their own gateway on port 1 and the PC's use their own on port 24.
In addition to VID 1 created VID 20 for the Data on all ports and Voice on VID 50 Voice as per this example I found.
Phones and PC's are on all the ports except 1 and 24.
AlI really want to do is give priority to the IP Phones.

[url="http://www.dlink.com/uk/en/support/faq/switches/layer-2-gigabit/dgs-series/es_dgs-1210_como-configurar-voice-vlan"]

The phones don't work and neither do the PC's when activated.
I have also setup the phones WAN port with VID 50 and the PC port with VID20.

Any help is welcome
I have not tried tagging P1 and P24 on all 3 the VLANS.  

Thanks
Ken
0
I am using the following query to get the CNAME record to load my site properly. The issue: The code below works ... but only if refreshed a couple of times.

Query ::

$recsDNS = dns_get_record($_SERVER['HTTP_HOST'], DNS_CNAME );
print_r($recsDNS);

Not getting CNAME records Properly, SOme times coming and some times Not.

If I use DNS_ALL :: After refreshing 3 to 4 times i am getting CNAME records.
0
Hi Experts,

Is it possible to filter a source AS Path? Situation I have is that BGP was set up under AS 1 and instead of reconfiguring it (because I have a few VRFs that would be affected) I was wondering If I could just filter AS1 on my advertisements?

Thanks,
0
hi team
I have couple of question on packet loss
1.  what all steps we need to take for packet loss
2. what are avialbale tools for checking packet loss
3. what are possibilities  of packet loss
4. what are the parameters to check packet loss
0
What does it mean to be "Always On"?
LVL 4
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

I want to configure 1 ISP that delivers two MPLS circuits via different routers that i need to connected to a cisco 3750 layer 3 switch or single router. The provider is delivering me two MPLS circuits but i been challenge to get the circuits configure on a L3 Cisco switch or router, that when a circuit is very busy it can use the second circuit.

attach is a topology. if a good configuration is out there please help me on this.

hope the topology is good.
Topology.docx
0
Hi Experts,

Do you guys have any good material on how to transition ospf to exist with vrf ?
0
Hello All
Our core network consists of four Juniper SRX 240h security appliances. They are connected in a ring and use OSPF as the internal routing protocol. On core facing interfaces and ports we use to connect access switches, we have discovered the ‘FIFO errors’ field is incrementing on almost all the interfaces on all four devices. FIFO transmit errors are all 0 but the receive errors value is steadily rising.

After some research online it appears that if the value is not 0, there is most likely an issue with the PIC on the device. As this is happening on all devices it seems unlikely to be a hardware failure but I’m not ruling it out.

Statement from the Juniper website:

•      “FIFO errors—Number of FIFO errors in the receive direction that are reported by the ASIC on the PIC. If this value is ever nonzero, the PIC is probably malfunctioning.”

I’ve also read it is a possible auto negotiation problem on the interfaces. We can see the devices are negotiating the correct duplex and speed settings. On one of the links in the ring, there is no FIFO errors at all on the interface. Also it has auto negotiation setup suggesting to me the problem must be somewhere else.

Example MAC stats output:
  MAC statistics:                      Receive         Transmit
    Total octets                   23084979779      15333372494
    Total packets                     29358714         26257095
    Unicast packets                   29357335         26255717
    Broadcast …
0
netdiagram.docx

I don't have any experience with etherchannels but want to configure an etherchannel from L2 switchs to an L3 switch. The L3 switch is routing between two different VLANS. In order to do this would I need to set the virtual port to L2 or L3? (switchport or no switchport, assign an IP to the port on the L3 switch and no IP on the L2 port etc?)

Thanks for the help!
Jess
0
Hi,

I have a server running filezilla server and is configured with ftp over tls.

I know this server is fine because I can connect and upload files fine from a number of locations.   However I have an issue in one particular location behind a watchguard firewall.

The connection establishes successfully and sometimes it can upload a file or part of a file before it fails when configured to ftp over tls.
If I change to ftp it works fine.

I have read that this can sometimes be an mtu issue but don't know how or where to change this.   Please can anyone shed light on this.  

Attached is the filezilla server log and errors it sees.
0
how i can Develop ipv6 ?
i want add new rule to notation . the third one ^^
0

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.