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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First, I'm a novice with SSIS, having mostly just maintained existing packages.  I have a project that I upgraded from SQL Server 2008 R2/Visual Studio 2008 to SQL Server 2016 (deployment model) in VS 2017.  All of the packages work running locally on my machine just as they always have, with the exception of one.  

This loops through oledb source servers  using a connection string built by variables received from a query.  Then it starts the control flows, which each has a series of data flow queries.    The weird thing is sometimes it runs fine.  Most of the time I get errors like this:

[NetComply - CollectionMembers [212]] Error: SSIS Error Code DTS_E_OLEDBERROR.  An OLE DB error has occurred. Error code: 0x80004005.
An OLE DB record is available.  Source: "Microsoft SQL Server Native Client 11.0"  Hresult: 0x80004005  Description: "Protocol error in TDS stream".
An OLE DB record is available.  Source: "Microsoft SQL Server Native Client 11.0"  Hresult: 0x80004005  Description: "Communication link failure".
An OLE DB record is available.  Source: "Microsoft SQL Server Native Client 11.0"  Hresult: 0x80004005  Description: "TCP Provider: An existing connection was forcibly closed by the remote host.
An OLE DB record is available.  Source: "Microsoft SQL Server Native Client 11.0"  Hresult: 0x80004005  Description: "Communication link failure".
An OLE DB record is available.  Source: "Microsoft SQL Server Native Client 11.0"  Hresult: 0x80004005  
0
Build an E-Commerce Site with Angular 5
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I use "Remote Desktop Connection" from my windows PC to connect to remote Linux Virtual Machine running Ubuntu 18.04.2 LTS.
I open terminal window and type following command to clone git repository:

git clone git://git.yoctoproject.org/poky_local_copy

The response is as follows:
git connection failed
I open Mozilla Firefox Web Browser, enter git.yoctoproject.org and connect.  Why Web Browser connects to this site but from terminal cannot connect to this site?
0
Hello,

I've been given two servers for a PHP project inside my company (one for PHP and the other for MS SQL) but my local system administrator has never dealt with remote SQL connections (yeah, I know).

I've managed to use his admin session (thru Skype's desktop presentation) and configured the SQL instance to use a fixed port instead of dynamic (to avoid headaches in the future). I've also created an inbound rule in the SQL server's firewall that allows that same TCP port for the domain. I didn't create an inbound UDP rule for the SQL Browser because I'm not using a dynamic port.

Also, the user that I'm using in my PHP script was created under Security -> Logins but within the database, instead under Security -> Logins for the entire SQL instance. It was created as dbreader and dbwriter only.

This is how my PHP connection looks like (the x are IP address and NNNNN is the port):
$servername = "xxx.xxx.xxx.xxx\\INSTANCENAME, NNNNN";
$connectionInfo = array( "Database"=>"MY_DB_NAME", "UID"=>"loginname", "PWD"=>"somepassword" );
$conn = sqlsrv_connect( $servername, $connectionInfo );

if ($conn) {
     echo "yup";
} else {
     echo "nope";
}

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What else can I try to make the connection happen?

BTW, both sqlsrv and pdo_sqlsrv extensions are loading fine in PHP.

Both servers are Windows Server 2016 and SQL is also 2016.

Thanks in advance!
0
BGP Configuration with and without another IGP

in the topology below, I would like to know if :

-- BGP needs to be configured on R1  R2,R3,R4  without any other IGP (OSPF)configured on the same routers.
-- Or BGP can be configured only on R1 and R4, but IGP (OSPF) should be configured on all 4 routers R1,R2,R3,R4

Thanks


b
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OSPF Address-Family

I have seen  in some examples EIGRP configured with   address-family ipv4 vrf <VRF Name>  autonomous-system <AS Number>
However I have not seen examples where OSPF  is configured with  address-family ipv4 vrf <VRF Name>

for instance, in the topology below Customer Edge CB_1 uses OSPF  and  it is connect to PE_1

Thanks

m
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Hi, I ran this wireshark network protocol analyzer with no programs open, including no background programs. I ran it for three minutes. I have the report in csv and in pcapng format.(I've changed the latter to a .txt extension to upload).

Can someone let me know if there's any odd network activity going on? Thanks. If you need more information, let me know, this is way over my head.
packet-dissection.csv
packets---Copy.txt
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Naive Question on the Bandwidth versus Throughput

EE Members / Gurus ,

Need your help to clarify the definition

1. If i hear in a meeting , client has internet link of 40Mb . Does this means his bandwidth is 40Mb or the throughput ?
Does this 40Mb in case if it is bandwidth inclusive upload/download speeds ie 20/20

2. What does the terminology means ' ' pipe can handle 80Gb of traffic ' . Does this mean the backbone / backplane speed can or should handle this traffic

Regards,
Sid
0
NFS on netapp filer - very slow only when over a hop


hi out of the blue. - juniper in the core  CIFS has slowed to crawl off a netapp - engineer did put a route in but only in prep for a change - it seems from that point on NFS browse to the netapp is soo slow its unusable
we since removed the route - but its just as bad no difference
dont even know if what he did was related

anyway if you are on the same subnet as the cifs netapp filer  (eg on a server in the same subnet )CIFS  performace is fine!!!
as soon as a hop to get to filer cifs share - its hopeless

Netapp 8.3 data on tap - Juniper core switched HELP
0
Connect 2 Networks that use Different Routing Protocols.

I would like to know in the case we have 2  separate Networks  , one runs OSPF and the other one runs EIGRP.  If I need those 2 networks to be able to talk to each other without using Redistribution nor MP BGP, would that be possible?  for Instance using VPN GRE Tunnel or IPSEC VPN Tunnel ..

Thank you
0
I need to analyze PCAP files and APIs for an MVNE I am working with.  I can definitely see some things in the PCAP files they sent, but I would like to be able to do a lot more and more deeply analyze it.  I have been using wireshark to break it down but what is the best way to attack analyzing these files.  Is there a resource out there, program, best practice, etc.
0
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I am attempting to configure VOIP multicast paging for a member school district. Currently, when a phone page is initiated, the green speaker light on the phone comes on and the mic red (mute) light comes on at same time.However, the page is not able to be heard on any phones. I am told this did work at one time but no one seems to be clear when it stopped working. As of yesterday, I upgraded their WAN switch and I am attempting to get the paging to work again.

Specifics.

Cisco Informacast server (Handles paging) is located on the WAN and is directly connected to a  vlan 110 port (near-end)
VOIP phones are located at the district on the far end of our WAN (far-end)

Near end switch connected to Informacast server on vlan 110:
HP 5412R , J9851A running KB.15.17.0007

Far end switch hands all vlan 110 VOIP traffic off to VLAN 72 (Phones):
Aruba 3810M, JL071A running KB.16.07.0003

Vlan 110 is configured on both switches and vlan 72 is only configured on the far end.


Obviously, the config is non-working (copied over from old switch) and has been modified in an attempt to resolve the issue but I will post for reference and advice on what to change.

near end switch vlan 110 config:
vlan 110
name "VLAN110"
untagged A3,B5-B6
tagged
A4-A9,A11-A19,A21-A22,A24,B1,B4,B7-B8,B13-B22,C1-C24,D1-D24,E1-E24,F1-F22
ip address 10.201.0.1 255.255.248.0
ip igmp
ip igmp forward A1,A3-A24,B1-B2,B4-B8,B10,B12-B22,C1-C24,D1-D24,E1-E24,F1-F22
qos priority 7
forbid B2
0
There seems to be some sort of mysterious redirection going on when i try to access the site at
http://fostamells.technojeeves.com/

A static file, such as http://fostamells.technojeeves.com/license.txt comes out fine but the attempt to access the homepage seems to land on a page of the company that hosts technojeeves.com. I really can't see why. Is it Wordpress doing this or what (after all it does say X-Redirect-By: WordPress)? I've attached a wget debug log of the attempt to get the homepage
wp.log
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I have a scenario where I need a load balancer
When a new tcp connection is initiated from the client, the load balancer much assign a server, and always route all traffic from that that to the server it initially picked

When I netstat, I see and ipaddress and port for the client. (connection) so it makes sense to use this as the identifier for that client

Is there any software in exisitance to do this? Or do. I need to write my own?
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ASBR Without Valid Area

I have noticed when I redistribute connected subnets  on OSPF Stub Area I get the message below :

R3(config-router)#redistribute connected subnets
R3(config-router)#
*May 20 21:12:59.726: %OSPF-4-ASBR_WITHOUT_VALID_AREA: Router is currently an ASBR while having only one area which is a stub area

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However OSPF will still take that command as shown below:

R3#sh run | sec ospf
router ospf 1
 area 1 stub
 redistribute connected subnets
 network 192.168.23.0 0.0.0.255 area 1
R3#

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So any one can explain the meaning of that message ?

Thank you
0
ABR in Stub area not blocking External Routes
ar
In the topology above I have configured R2 area 1 as stub the same for R3
R3 is blocking External Routes E2 and injecting IA default routes, but R2 is still allowing E2 [External routes]

R2#sh run | sec ospf
router ospf 1
 area 1 stub
 network 192.168.12.0 0.0.0.255 area 0
 network 192.168.23.0 0.0.0.255 area 1
R2#

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R3#sh run | sec ospf
router ospf 1
 area 1 stub
 network 192.168.23.0 0.0.0.255 area 1
R3#

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R2#sh ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      7.0.0.0/32 is subnetted, 1 subnets
O E2     7.7.7.7 [110/20] via 192.168.12.1, 00:41:55, Ethernet0/0
      9.0.0.0/32 is subnetted, 1 subnets
O E2     9.9.9.9 [110/20] via 192.168.12.1, 00:41:55, Ethernet0/0
      11.0.0.0/32 is subnetted, 1 subnets
O E2     11.11.11.11 [110/20] via 192.168.12.1, 00:41:55, Ethernet0/0
O     

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NSSA Default-Information-Originate

I would like to know  the OSPF area type where we use  the command NSS Default-Information-Originate

---On Stub area : we configure all routers inside the are with : Area X  Stub
--- On Totally Stub : we configure all routers inside the area with :Area X Stub, and the ABR with Area X Stub Non-Summary
---On NSSA area  : We configure all routers inside the are with : Area X NSSA
--- On Totally NSSA: We configure all router inside the are with : Area X NSSA and the ABR with Area X NSSA Non-Summary

However I am not sure how we call the area type where we configure :NSS Default-Information-Originate


Thank you
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OSPF Routing table not showing OSPF Routes
os
in the topology above

I have configured ospf on R5,R6,R8,R9 in Area3 , however the OSPF routes show only on R5 and R6 but not for Area3 ,  R8 and R9 do not show OSPF routes in their table
I can ping between all 4 routers

Though every now and then a message about OSPF Adjacency comes up on the console
*May 17 21:46:07.003: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.99.9 on Ethernet0/0 from LOADING to FULL, Loading Done
but when I run Show IP Route , no OSPF routes show up

R8#  sh ip route
      192.168.99.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.99.0/24 is directly connected, Ethernet0/0
L        192.168.99.8/32 is directly connected, Ethernet0/0
R8#

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R9#show ip route
      192.168.99.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.99.0/24 is directly connected, Ethernet0/0
L        192.168.99.9/32 is directly connected, Ethernet0/0
R9#

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it looks like that there is also Neighborship formed:
R8#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.99.5      1   2WAY/DROTHER    00:00:35    192.168.99.5    Ethernet0/0
192.168.99.6      1   FULL/DR         00:00:33    192.168.99.6    Ethernet0/0
192.168.99.9      1   FULL/BDR        00:00:[code]

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[/code]

R5 and R6 OSPF table does not show the OSPF routes for Area 3 which is the Network 192.168.99.0/24

R5#sh ip …
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IP OSPF Network Point to Point on Frame Relay

os
I have configured IP OSPF Network Point to Point on R1,R2,R3 serial0 Interfaces.

however from R1 , I do not see both neighbors together, it keeps showing sometimes the 2.2.2.2 which is R2 and sometimes 3.3.3.3 which is R3
I am not sure why it is doing this flapping.

Any help will be very appreciated

Thank you

R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           0   FULL/  -        00:00:38    123.0.0.3       Serial0/0
R1#

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R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           0   FULL/  -        00:00:38    123.0.0.2       Serial0/0

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I wonder if the reason that neighborship is flapping because all 3 routers are in the same subnet, and Point to point requires that they need to be in separate subnets ?
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I am just curious if every ISPs will accept a /24 subnet for BGP advertisement.  If not, is there a way to find out what they do accept and/or who doesn't accept this?

Secondly, we have a primary ISP that is advertise a /16 and on the secondary ISP, we advertised a /24 subnet (that is included in the /16 of the primary ISP) to test speed and throughout..etc to avoid having to bring out the primary circuit.

We're seeing some different throughput when testing with speedtest.net and when changing the server to a local city, we're getting latency error so not sure about this.

The /24 is a local subnet on the second ISP router and I Just advertised this under the BGP statement and we have a default route out with a next hop of our second ISP.  The second ISP has a static route for this /24 to us and a default route out to the internet.

Not sure what might be causing some latency errors when changing the speedtest to some local servers.   It seems to be fine if we change the server to Seattle, Washington for example and I'm located in SF.

thank you!
0
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OSPF LSA  Updates and Hellos

on the Screenshot below , we have DR and BDR

I want to know if other routers will have to send an update(LSA type 1) to DR and BDR, or they will send an update (LSA type 1) just to the DR, and the DR will send (LSA type2) to all the routers including the BDR

OR

Other Routers  will  send an update(LSA type 1) to 224.0.0.6 then DR and BDR will get the Update but only the DR that will send (LSA type 2) to 224.0.0.5 (where all other routers are listening to)

in case of the second case , I wonder how does BDR get LSA type 2 from DR

Thank you

DR
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Understanding IP OSPF Network Types.

On the screenshot below, it shows a table of IP OSPF Network Types.
Regardless of how neighbors are discovered, if DR/BDR are elected,etc...
I would like to know in which scenario should I use one type and not the other.

Thank you

ospf
1
I've been examining the network routing table on my Windows computer, and I'm wondering why there are 3 entries instead of just 2.

At a command prompt I type "route print".

The resulting display has columns "Network Destination | Netmask", "Gateway", "Interface".

I'm wondering what the difference is between a Gateway and an Interface.

I'm thinking of a very simple Dial-Up Network setup:
Network AdapterThe Network Adapter has the following IP address:
Network Adapter IP addressIs this the "Gateway" IP address, or the "Interface" IP address? And what would the other IP address be for

If I wanted my program to send some data to IP 1.1.1.1, and I want this data to go out over Network Adapter 7.7.7.7, I could add to the network routing table a line with: 1.1.1.1   255.255.255.255 for Destination and Mask, then would I add 7.7.7.7 to the "Gateway" or to the "Interface"?
0
I've usually tried to attract inbound traffic to one edge router over another by prepending AS numbers on the less preferred edge router. Are there other common methods to suggest that you'd prefer traffic at one edge bgp router than another?
0
My understanding is for sockets, connect sets the destination IP address, and bind sets the return IP address.

What would happen if I created two sockets, socka and sockb, and did:
socka.connect(10.1.1.2);
socka.bind(99.0.0.1);
sockb.connect(99.0.0.1);

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If I now send some data to sockb, will the data go to socka and then will socka forward that data to IP address 10.1.1.2?
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vSphere HA Agent on this Host[Esx 6.5] Could not Reach Isolation Address 10.X.X.X  ie Gateway IP

Raised with Network Team saying all fine from Network end while we are not able to ping anything except Host IP ,No result in traceroute too

Please assist for required action plan to fix the issue
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.