Networking

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Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

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We are provisioned Two 2960x Cisco Switches and linked up with a FlexStack Plus cables/modules. All connected devices (e.g. Windows Servers) has two UTPs connecting to the switches, one to switch A and another one to switch B. The switches are implementing Channel Group using LACP where port from Switch A and Port from Switch B are belongs to the same Channel Group for network resilience purpose. Also, we have created TWO VLAN on the switches where each VLAN span across the two switches some network device are belong to VLAN 1 and some are VLAN 2. This is a floor level implementation and we have an uplink router (Core Switch) to route packet between VLANs.

We are planning to add more devices and we are running out of switch ports. Our expansion planning are as follows:

Option 1) Add another two network switches (i.e. 2960x) to the FlexStack cluster and create additional channel groups with switch port from Switch C and Switch D. So that the new devices can connecting to the new Switch C & D while still maintaining the resilience requirement as well as able to communication with the original devices connecting to switch A & B.

Option 2) Option 1 is only feasible if we have enough room to accommodate another two switches on the same rack. If however, we need to put the new two switches on another rack with is around 10-20 meters away still connecting themselves with FlexStack Plus, we are planning to purchase a 10G SFP+ module on the switches and link up Switches A/B …
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Free Tool: Path Explorer
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Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

bgp
I have the topology shown above. I have configured BGP on R1 which is in AS1 and on R2 which is in AS2
now when I run Show Ip BGP command on each router I get the output shown below. I need an Expert to explain the meaning of the Output  below. especially the lines :
r> 2.2.2.2/32       192.168.12.2             0             0 2 i
*  192.168.12.0     192.168.12.2             0             0 2 i
*>                  0.0.0.0                  0         32768 i




R1#sh ip bgp              
BGP table version is 5, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 1.1.1.1/32       0.0.0.0                  0         32768 i
r> 2.2.2.2/32       192.168.12.2             0             0 2 i
*  192.168.12.0     192.168.12.2             0             0 2 i
*>                  0.0.0.0                  0         32768 i
R1#

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R2#sh ip bgp         
BGP table version is 5, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
r> 1.1.1.1/32       192.168.12.1             0             0 1 i
*> 2.2.2.2/32       0.0.0.0                  0         32768 i
*  192.168.12.0     192.168.12.1             0             0 1 i
*>                  0.0.0.0                  0         32768 i
R2#

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Good afternoon Experts,

Our Security Manager asked me to upgrade his existing IP camera network from 10/100 to Gigabit from our Control Room to our guard stations, roughly 150 meters away. The existing network we have been using is 2 Comnet devices, model CNFE6+2USPOE. More details on this device here:

http://www.comnet.net/comnet-products/ethernet/self-managed-switches/cnfe62uspoe.html

I decided to purchase 2 Netgear, model ProSafe-GS110TP:

https://www.netgear.com/support/product/GS510TPP.aspx

Connected with TrendNET TEG-MGBSX SFP Modules

https://www.trendnet.com/products/proddetail?prod=200_TEG-MGBSX


My issue is that I get no link light when I set up a switches in both locations. I have tested the units side by side and it all works, but for some reason when I get them set up in their specific location I no longer get link lights. I'm using the existing fiber run that the Comnet devices are on, and have confirmed it's 50/125 fiber, and I've tested the new short fiber cables we bought and they work as well. The TrendNET SFP modules should be rated at 550 meters.

In my other experience things like this just fire up, then you make sure the VLAN's are correct, but in this case I get link down in the Netgear GUI and obviously no sweet flashing green light.

Am I missing the forest through the trees here?

Thank you for any guidance.
0
I have about 20 POS stations I'd like to place on a dedicated VLAN, but I'm not sure how exactly to go about this.  Each station needs to talk to servers in the main network and to the internet.  Ideas?
0
I have a verizon wireless net extender for signal increase. The extander needs port tcp 53 allowed for this to work. I have included the below packettrace and it looks like it's passing through just fine but... the extender does not work. If I bypass the ASA, it works even though I did not configure any NAT or permit ACL's. I was assuming that since the device start the communication, that I dont need it. I also included a link to verizon about what config I need on ASA. How can I make this work>?

https://www.verizonwireless.com/support/knowledge-base-25525/

FW/pri/act# packet-tracer input inside tcp 10.255.8.20 1234 69.78.34.151 53 detailed
Phase: 1
Type: ACCESS-LIST
Subtype:
Result: ALLOW
Config:
Implicit Rule
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0x2aaadaf78770, priority=1, domain=permit, deny=false
        hits=2410723433, user_data=0x0, cs_id=0x0, l3_type=0x8
        src mac=0000.0000.0000, mask=0000.0000.0000
        dst mac=0000.0000.0000, mask=0100.0000.0000
        input_ifc=inside, output_ifc=any

Phase: 2
Type: ROUTE-LOOKUP
Subtype: Resolve Egress Interface
Result: ALLOW
Config:
Additional Information:
found next-hop ******* using egress ifc  outside

Phase: 3
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group inside_in in interface inside
access-list inside_in extended permit ip any4 any4 log disable
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0x2aaad7b2c010, priority=13, 

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I need to redistribute two (of about 10) static routes into BGP.  My memory  of route-map configurations are a little fuzzy.... does this look right?

ip route 1.1.1.1 255.255.255.255 2.2.2.2 tag 100
ip route 1.1.1.2 255.255.255.255. 2.2.2.2 tag 101

Route-map Static_Routes permit 10
 match tag 100 101

router bgp 00000
 redistribute static route-map Static_Routes
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we have a Windows Server 2012 R2 with functioning RD Gateway with published apps. It works from everywhere expect one office network location. We have there a SOHO Asus RT-ACRH13  firewall. Computers that can log in from other network locations are unable to login from that location (snapshot attached). We have disabled the firewall feature on it but no luck. Any other ideas what to do?

I also get an error 20499 on the server

Remote Desktop Services has taken too long to load the user configuration from server

BUt I'm able to login from another network with a different firewall just fine
snap1.png
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Hi Team,

I'm working on creating an sql failover cluster across multiple subnets in different locations. These 2 virtual servers being clustered are window servers 2016 running on vmware 6.5. After enabling the Failover Cluster in windows I went ahead and proceeded to validating the cluster which gives me the following error when it goes through the network communications test:

 * Node SQL1 is not reachable from node SQL2. It is necessary that each cluster node can
    communicate each other cluster node by a minimum of one network path (though multiple paths
    are recommended to avoid a single point of failure). Please verify that existing networks
    are configured properly or add additional networks.

Although I can ping both hosts from each other and made sure all firewall ports where opened between these 2 networks. I'm not sure whats going on here, I've done multiple hours of research in google but can't figure it out. I'm hoping someone here as some experience with this and can point me in the right direction.

Thank you!
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I have a client whos office is part of a managed office environemt with managed network. Recently their network was moved from one VLAN to another which resulted in the subnet changing from 192.168.6.0 to 192.168.7.0.

Whilst connected to the 192.168.7.0 VLAN Outlook is unable to send emails via the SMTP server which has been working fro months.

When I request that they are moved back to the 192.168.6.0 VLAN the connectivity resumes.

I have run "telnet SMTPHOSTNAME.com 25" on both VLANS and on one I get a 220 response but it timesout on the other.

To me this suggests that there is something blocking the SMTP traffic on the 192.168.7.0 VLAN.

The company that managed the network says there is nothing blocking it and that they think its because my clients domain name does have a SPF record associated with it. I feel this is irrelevant in this situation.

Can someone clarify for me?
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I setup a Exchange 2016 Server in-house and cannot figure out why the Outlook Test Email AutoConfiguration on all in-house network clients and from the Exchange Server Management Shell Test-Outlook WebServices keep failing.  All workstations are Outlook 2016 and at first I also had a problem seeing the public folders but they are now viewable.  Something is goofy and I've triple checked everything and I can't figure it out.  Outlook says downloading address book for days.

Outlook had no problems when adding a profile finding the account automatically.  I've flushed DNS on all computers, rebooted, and tried a new Outlook profile - no chanage.  

OWA and ECP (Exchange Admin Center) work internal and external.  Cell phones have no problems adding accounts.  External DNS is setup.

Any assistance would be greatly appreciated.  I've tried so many fixes from other web site posts, articles, and many from other posts on Experts-Exchange.

Please see attached images to see failure messages and external DNS setup.

Regards,
Torrey
HD_AutoDiscover_Fail1.png
HD_AutoDiscover_Fail2.png
HD_AutoDiscover_Fail3.png
HD_AutoDiscover_Fail4.png
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Free Tool: ZipGrep
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Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

An SMTP server connection timeout error occurred. The SMTP server or network is overloaded.  I've provided my SMTP Server Settings below. This was working up until a couple of days ago.


SMTP Server Address: smtps-proxy.messagingengine.com
Port Number: 465
SMTP-SSL/TLS Comm: Disabled or StartTLS or SSL/TLS (Either selection returns a different error message)

Error messages: "Completed with an Error (016-513) SMTP server reception error."
2Nd error: "Completed with an Error (017-714) SMTP over ssl failed."
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Dear, I got this error from today morning. All the servers in this network range could not be accessed like attached screenshot.

When I tried to access these servers from the same ISP (which provide this network range to us), the servers COULD be accessed; but when I tried from other 2 ISPs, they COULD NOT be accessed.

The servers are Window Server 2012R2 Standard, have Kaspersky, Firewall but they are configured properly, nothing change (this error started from today morning)

Can you please suggest?
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Hi guys,

We currently have a 6 switch stack (SG500's) and we are moving to another building that will require us to increase our switch size to 9.  We are aware that only 8 SG500's are available per stack so I was wondering what the optimal switch setup should be.  Do we need to buy a core switch to maintain performance?

Thanks in advance.
0
Hi

With this config from POE switch s5500 connected to core S5120 i got the phone working but i could connect or ping the S5500 ip address switch ... What's wrong !!

Is it the write config for a voice vlan setup like this (Core switch + poe) phone-pc connection !!

------------------------------------------------------------

Port connected from S5500  to core  S5120 port 10

interface GigabitEthernet1/0/48
 port link-mode bridge
 port link-type hybrid
 port hybrid vlan 210 tagged
 port hybrid vlan 1 untagged

--------------------------------------------------------------------

Phone port on S5500

interface GigabitEthernet1/0/19
 port link-mode bridge
 port link-type hybrid
 undo port hybrid vlan 1
 port hybrid vlan 210 tagged
 poe enable

---------------------------------------------------

Port on core switch S5120 connected to S5500 on  port 48

#                              
interface GigabitEthernet1/0/10
 port link-type hybrid          
 port hybrid vlan 210 tagged    
 port hybrid vlan 1 untagged    
 undo voice vlan mode auto      
 qos priority 6
0
What to include in a sales and marketing office , research and development centre and outsourcing centre?
0
Hi there,

We have Ex2010 and Ex2016  running. We tested migration and the users are able to work on both sides. But the migration process is veeeeeeeeeeeeeeeeeeeeeeerrrrrry slow and exchange is only moving one box at a time. The others are stalled with "StalledDueToTarget_DiskLatency". We checked storage, network, antivirus ... nothing found that could be a problem. When we copy a file directly from one machine to the other it copies with a blast.

Ex2016 Databases are in DAG. Created a MBX out of the dag to check if it is the problem - no.

Installed Exchange 2016 CU 6.

Ripping my hair out :( Any ideas?

Regards,
Marcel
0
I need your help guys...!

One of my Access databases on our shared network will not open for any user. It is showing "Unrecognized Database Format." I've this problem before but was still able to open the database, compact and repair, or import all of the database objects into a new database.

The problem here is -- I can't even get it to the point of opening. Is there a solution here without the use of third party software to repair the database?
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we are doing some risk assessment work on backup processes from a risk management perspective (we have no responsibility for doing them ourselves), aside from servers, which host the critical data/files, what other devices in a network need considering in backup policies, so we can interview the department responsible to see that they are included/tested.
0
Hi,

I am using Outlook 365 for my emails, i configured my exchange account which is working fine when i am in house (office) where my exchange server i located. but when i move out and connect to the other network, even to my mobile hotspot may email get disconnected.
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Building an interactive eFuture classroom
Building an interactive eFuture classroom

Watch and learn how ATEN provided a total control system solution including seamless switching matrix switch, HDBaseT extenders, PDU, lighting control to build an interactive eFuture classroom.

Hello experts. I am trying to setup a VLAN in a test environment and I am not able to get it to work so far. I have searched this board and researched online but just can't seem to get it to work.

Right now I have two Comcast internet circuits coming into a peplink balance 20 (will be upgraded to the balance 305) I have one cat 6 patch cable going from the router lan port 1 to Switch 1, port 1. I have a total of 5 sg200 switches, all connected by 4 port LAGS and fiber.

I want to have 3 VLANS. On the peplink under LAN--->network settings I created the VLANS as 10 with an IP of 192.168.10.1 with DHCP enabled for 192.168.10.2 - 192.168.10.250, VLAN 20 as 192.168.20.1, VLAN 30 as 192.168.30.1 all with DHCP enabled. Under LAN--> port settings I have port 1 set to trunk and tagged the 3 VLANS.

I have the VLANS setup on all of the switches. On Switch 1, port 1 where the router is connected I have it set to tag the 3 VLANS I created.

On Switch 1, port 5 I have a laptop connected to test. I have that port set to access and VLAN1 to exclude, VLAN10 as untagged. From this point I am unable to get a dhcp address and if I enter a static ip I am unable to get internet access.

Is everything correctly configured so far? Right now everything is operating from the one switch. I haven't tried other ports on other switches.

What do I configure the LAGs as?

Any help will be VERY much appreciated!

Thanks in advanced,
CJ
0
Two Windows 10 64-bit OS computers are unable to backup to a QNAP TS-451 NAS while these laptops are connected to the Wi-Fi while running the free version of Veeam v.2 (see the screenshot).

However, these same two laptops are able to backup just fine while their Wi-Fi is disabled and they are plugged in with Ethernet cables on the same network.

What can be done to fix this issue so that these two laptops will be able to backup to the NAS while connected to the Wi-Fi and without being plugged in with network cables?

WI-FI-BACKUPS-FAIL
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Dear Sir we have wifi routers in our internal network that are connected thru lan switches. wifi routers connect with wire in WAN port and then further Routers DHCP change the class for routers client, i am able to control the traffic of WAN port IP from TMG but unable create a different rules for routers clients.....
any idea please..!
0
I have an HP EliteBook 8730w HP machine with XP SP3.  The NIC is a 82567LM Gigabit.  Wireshark Version 1.6.1 is seeing a flood (packet ea/.001068 seconds +/-) of protocol 0x8899 Ethernet II packets (All outgoing; no responses).  Packet length ranges from 64 to about 1499 or 1518 packets long. The problem I have is that I cannot find the Source MAC on my (small home) network (I have tried several MAC scanners), nor do I know anything about the destination address.

Source:  f8:c0:01:7c:65:cc
Destination: Dell_79:08:f2 (00:19:b9:79:08:f2)
Type: Unknown (0x8899), Ethernet II
Data (1504 bytes)
5 lines of data:
0010   88 64 11 00 14 ef 05 d6 00 21 45 40 05 d4 ac 25  .d.......!E@...%
0020   20 00 36 11 54 58 47 13 fb f9 61 73 b9 db a0 e1   .6.TXG...as....
0030   c9 be 05 cd 4b 14 32 bb 81 3a 22 b9 5d 95 21 4e  ....K.2..:".].!N
0040   6d 27 cb 53 59 65 0b 8d 75 33 cb ab f9 de 7e 52  m'.SYe..u3....~R
0050   32 57 86 24 53 27 ee 64 20 41 72 31 20 11 2a 43  2W.$S'.d Ar1 .*C
.
.

So, I have no such source or destination MAC on my network (that I can tell) , am seeing  an ongoing flood  of data anytime day/night.  To my knowledge, I have no Dell equipment on my network (two printers, 4-5 computers, a couple of Smart phones, and several Security DVRs).  Most computers behind one or more switches.  I am certain that I have no Realtek routers/switches or anything that might be using a managed protocol i.e. Realtek Remote Control Protocol (RRCP) Type 0x8899.
0
bgp
On the  screenshot above R1 is in AS1 and R2 in AS 2
I advertised Loopback networks from both Routers, but cannot see it in each other router BGP table

R1#sh run
Building configuration...

Current configuration : 1519 bytes
!
! Last configuration change at 19:08:12 UTC Tue Jul 25 2017
!
upgrade fpd auto
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
!
!
ip source-route
no ip icmp rate-limit unreachable
ip cef    
!
!
!
!
no ip domain lookup
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
redundancy
!
!
ip tcp synwait-time 5
! 
!         
!
!
!
!
!
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
 !
!
interface FastEthernet0/0
 ip address 192.168.12.1 255.255.255.0
 duplex half
 !
!
interface Ethernet1/0
 no ip address
 shutdown
 duplex half
 !
!
interface Ethernet1/1
 no ip address
 shutdown
 duplex half
 !
!
interface Ethernet1/2
 no ip address
 shutdown
 duplex half
 !
!
interface Ethernet1/3
 no ip address
 shutdown
 duplex half
 !
!
!
router bgp 1
 no synchronization
 bgp log-neighbor-changes
 network 1.1.1.1 mask 255.255.255.255
 network 192.168.12.0
 neighbor 192.168.12.2 remote-as 2
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip route 2.2.2.2 255.255.255.255 192.168.12.2
!
no cdp log mismatch duplex
!
!
!
!
!
!

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SCCM 2012, image process fail just after format C: drive.
The System was working fine until yesterday.
I check the network access account, password is fine.
I do not find any errors in the smsts.log file.  
I try three different machines, same error at the same time of task sequence.
I change the boot image, recreate the task sequence, and same problem
I attached the smsts.log
0

Networking

90K

Solutions

66K

Contributors

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.