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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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
Free Tool: IP Lookup
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Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

We just moved from WinINET to WinHTTP. The latter does not have an equivalent InternetCanonicalizeUrl function.

The WinHTTP docs say that WinHTTPOpenRequest does this automatically but there is nothing there that specifically addresses this.

According to this reference you can use WinHTTPCreateURL which uses a URL_COMPONENTS structure to define the various URL parts. In the latter the lpszExtraInfo property is where you put the ?param=xyz& ... part.

Here is my problem - one of the parameters in the paramter string needs to be canonicalized as it could contain non-URL friendly characters (Example &).

With the WinINET version we used InternetCanonicalizeUrl on the specific URL parts which were then appended to the URL string.

Example
If we have a URL now that looks like this
mydomain.com?param='Name & Surname','Description'

Open in new window

And we pass that to WinHTTPOpenRequest - it does not know that the & in Name & Surname is data and not a parameter separator.

Question:
How do we canonicalize individual parameters in the URL with WinHTTP
0
Hi,



Can anyone help in identifying why once my vpn client enabled. I can  ping all other internal IPs except 192.168.4.1(interface DatabaseZone)  and 192.168.3.1. My vpn client assigned 192.168.5.100 which is in  the range ov VpHi,



Can anyone help in identifying why once my vpn client enabled. Cant ping any of internal IPs configuration like 192.168.4.1(interface DatabaseZone) . My vpn client assigned 192.168.5.100 which is in  the range of Vpnclients object-group configuration.nclients object-group configuration.

here attached output from "show vpn-sessiondb detail remote"
vpn-sesssiondb-detail.txt
0
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
I have cisco 3650 and 3560G connected one to one port as trunk. Ports are gig1/1/1 to g0/1

What is the recommended etherchannel configuration from port gig1/1/1, gig 1/1/2 to g0/1, g0/2?
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
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I can't seem to form PIM neighbors over a tunnel.  I have unicast reachability and added static mroutes for multicast traffic.  
We refreshed the spoke side, and the HUB remained up.  The spoke does not form a PIM relationship via the tunnel2, but the HUB still does.  Does the HUB side need to be torn down and built back up?  I read about clearing the mroutes, but not sure if I should do that?  

Hub

interface Tunnel2
 ip address 10.145.31.9 255.255.255.252
 ip pim sparse-dense-mode
 keepalive 3 3
 tunnel source Loopback0
 tunnel destination 10.76.15.130 (Loopback0 of Spoke)
end


Spoke

interface Tunnel2
 ip address 10.145.31.10 255.255.255.252
 ip pim sparse-dense-mode
 keepalive 3 3
 tunnel source Loopback0
 tunnel destination 10.50.70.32 (Loopback0 of Hub)
end

ip rp-address 10.1.1.5 (loopback1 of Hub)








Could it be an issue on how the tunnels are forming on the spoke?  Not sure if building two tunnels with the same IP is an issue.  

SPOKE#show ip int bri
Tunnel0                10.145.31.10     YES unset  up                    up      (PIM built)
Tunnel2                10.145.31.10       YES manual up                    up  (GRE)

SPOKE#Tunnel0
  Type       : PIM Encap
  RP         : 10.1.1.5
  Source     : 10.145.31.10
  State      : UP
  Last event : Created (00:10:35)



Just to add, the HUB is sending and receiving PIM Hellos, and the SPOKE is only sending them, but not receiving
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
I have cisco 3650FS-S as the main switch and I want to setup and configure cisco 3560G as a backup switch so if main switch fails, the secondary switch takes over with no impact? How to do this?
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
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
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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
I think the are getting in thru my router or my computer I seen she changed my 5g login in to public ny way to stop the ports they are getting in on?? thanks scott
0
If hardware is all the same, what's best practice for OSPF cost?


Left:
Egress and ingress are opposite of one another.  (Egress/Ingress are not on the same connection)  I like this setup, but i'm not sure if its best practice compared to the far right picture.  I prefer this idea because inflow/outflow aren't shared on a link, but is this enough justification to be BP?

Middle:
Each core will be responsible for their "side". (Left core/distro vs right core/distro)  Not sure if this is correct...i'm just guessing

Right:
Primary/Secondary setup.  (Left core takes care of everything, Right Core is backup)
OSPF-FLOW.png
0
Hey guys,

Looking for some guidance here, i have multiple RPM probes set up, but for some reason one of them isn't working. I can ping the target IP not problem

Here's a working one set up
    test Real-Time_to_EDTN {
        probe-type icmp-ping-timestamp;
        target address 10.73.255.2;
        probe-count 10;
        probe-interval 1;
        test-interval 300;
        source-address 10.92.6.39;
        dscp-code-points ef;
        data-size 64;
        hardware-timestamp;
        one-way-hardware-timestamp;
    }

Here's the set up of the "broken" one
   test SCI0001325538 {
        probe-type icmp-ping-timestamp;
        target address 10.92.6.34;
        probe-count 10;
        probe-interval 1;
        test-interval 300;
        source-address 10.92.6.39;
        dscp-code-points be;
        data-size 1400;
        hardware-timestamp;
        one-way-hardware-timestamp;
    }

 I am able to ping
ssoares@lbchabavppler001> ping 10.92.6.34 source 10.92.6.39 count 10 rapid
PING 10.92.6.34 (10.92.6.34): 56 data bytes
!!!!!!!!!!
--- 10.92.6.34 ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 12.082/13.292/19.538/2.189 ms

ssoares@lbchabavppler001> show services rpm history-result
    lbchabavppler001, Real-Time_to_EDTN                 Mon Mar 27 13:29:23 2017            11230 usec
    lbchabavppler001, Real-Time_to_EDTN                 Mon Mar 27 13:29:24 2017     …
0
Hi,

So I have 2 VLANs, 2 routers, 2 interfaces for each router, and 2 subinterfaces for each interface.
It works just fine with 1 interface (2 subinterfaces- one for each VLAN), but I can't do it for the second interface, as I can't assign IPs from the same class, I tried to fool it with /23, but obviously it doesn't work.

Anyone any idea? Please don't say VRF...

Thanks,
Anna
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.