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 will try my best to explain this.

Main Core Switch: HP 4208vl (11.40 Firmware)
IP Routing: Enabled
IP Default GW: 192.168.8.1
IP: 192.168.8.2 - VLAN8 (Primary Management)
Blade - G1 - X2 10GbE Fiber Module (Untagged on VLAN8)
Blade - H1 - X2 10GbE Fiber Module (Untagged on VLAN8)

New VMware Setup

(2) HP 2920-24 Port with Stacking Enabled  - Ring Configuration (Cabling)
IP Routing: Enabled
IP Default GW: 192.168.80.1
IP: 192.168.80.2 - VLAN1 (Primary Management)
Switch #1: Port A1 - 10GbE Fiber Module SFP+
Switch #2: Port A1 - 10GbE Fiber Module SFP+

When I am on DC (192,168.8.13) connected to the HP 4208VL switch; I try to ping 192.168.80.1 and receive "TTL expired in Transit"

The local router (Cisco 2921 running IOS 15.1) at this building and its IP is 192.168.8.1 and has IP Routing RIP Ver2 enabled  and Network 192.168.80.0 listed.

I believe this is either a routing issue or a stacking config issue. I tried researching about stacking but only found that i just need to type enable stacking on both of the 2920 switches. I know that part is fine because when I connect to the console ports i get the same config. I checked the config and it is turned on.

I just want these stacked switches to talk to the core (4208vl) switch. Any info to get this resolved would be greatly appreciated. I do have support on everything and will see if HP will help tomorrow morning. I just want to get this fixed so I don't waste my consultant's time on this issue.

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The Guest wireless network is not working properly. The SSID is broadcasting, you can connect to it, you pull an IP address from the DHCP server on the SonicWall but you can't ping the SonicWall (even though I enabled ping). You can't ping anything else either. I would think if it could pull a DHCP address then it is able to talk to the DHCP server correct?  The DHCP server shows addresses that it has handed out.
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Asa 5540 version 7.0(7) in front of exchange 2003 enterprise with the latest service pack, and GFI antispam box, queue builds up almost on daily basis, and we have to reload the firewall in order the get the email flowing, it works for a day then it happens again.
 no changes have happened since this started , we have relay taken care of already long time ago and we are good in that aspect. Also, "no fixup protocol smtp 25" was applied via command line on the firewall.

when I try to connect to our mx records' ip address from outside, i got "Could not open connection to the host, on port 25", if I do smtp test on mxtoolbox i get "
Connecting to 173.161.x.y

I'm the only administrator in the company, I have not made any changes for the past 6 months not even patching the exchange server. and everything was working fine until 4-5 days ago.

we confirmed in a previous question that it is a firewall issue not exchange, Please see question ID28389705.
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We will performing network maintenance tonight and will need to take an OSPF neighbor down.  I've read on some Google searches on performing a graceful shutdown and wanted to see someone's take on it.

I need to shutdown the OSPF on our 6509 and then re-enable it with a port channel configuration.  Can i use the "max-metric router-lsa" command against router ospf 100 to force this device to start shifting traffic to different routers/OSPF neighbors?

The 6509 is connected to 2 ASR's (Level 3 & Sprint) and another 7609 (which is also connected to L3 & Sprint). I need to shutdown interface gi 4/45 (facing the ASR L3) in order to upgrade to a 2gb port-channel and restore OSPF.  Is there a better method of performing a graceful shutdown?

Basic Topology attached

Red links indicate new PORT-CHANNEL


Thanks in advance!
Rob
Topology.png
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I checked out several links regarding the difference between a SAN and a NAS and I'm not understanding HOW block I/O is different than file I/O?
I also don't understand why block I/O is better than file I/O?
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I'm wondering where you add a community string so that I can monitor it using Solarwinds.
0
We have a cisco 6509 with a 1gb link to an ASR1004 utilizing OSPF.  This link is heavily congested and we would like to link agg or port channel another 1gb link.  Are there any caveats with OSPF on LACP? Will BFD need to be disabled?


I've attached the two interface configs from both 6509 and ASR.

6509

!
interface GigabitEthernet4/45
 description ASR1004A
 ip address 10.254.254.14 255.255.255.252
 ip nat outside
 ip ospf bfd
 bfd interval 150 min_rx 150 multiplier 3
end

 

ASR

!
interface GigabitEthernet1/0/2
 description gw6509-1
 ip address 10.254.254.13 255.255.255.252
 ip ospf bfd
 load-interval 30
 negotiation auto
 bfd interval 150 min_rx 150 multiplier 3
end

Thanks in advance

Rob
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I'm testing moving our Voip traffic onto its own voice vlan. We have Univerge 8100 with about 25 DT700's. Each phone has an Eithernet adapter so we just have 1 cable for each phone and pc.

We have a PoE Adtran Netvanta 1500 switch. I have everything working, switch is routing between vlans, trunks are working, pinging between both vlans working, and calls our going out of the gateway and back in.

The issue is the calls coming in and going out connect but I don't get voice. Everything local is working fine. So I figure it's probably something to do with a firewall rule or something. I have a static route on the sonicwall back to the switch vlan gateway for the traffic coming back in the network. We have a Sonicwall NSA.

Note: We didn't have any issues before when everything was on the same vlan.
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I would like to know if the Cisco SSL Smart Tunnel can co-exists along with the Cisco Any Connect VPN solution.

Is it possible to have this both worked together. I connect to my office network using Cisco Any Connect VPN solution to access office application.
In parallel I want to connect to a Web Site which uses Cisco SMART Tunneling.
Let me know if this is possible....
0
Hello,
I need some help.  I am trying to have Cacti monitor a switch that is at a different subnet.  I want to know is it possible to monitor a remote switch via a remote Linux server that has the same subnet of the switch.  The Cacti server is able to connect to the remote server via ssh.  
Can someone offer some help.
Thanks
0
Hi ,

What is the best way to implement when we have two ISP's terminated in two different Cisco routers. Two firewalls ASA's.

Please find attached diagram.

Thanks
Ammu
0
Hello:

At my work we have a 10 MB/sec Fiber Point To Point connection between 2 seperate locations.  The 2 locations are 14 miles away.

Currently all of the Data and telephony is stored at the Primary location and the secondary location receves all of its Data/Telephony needs from the Fiber Point To Point.

The Secondary location does have its own Internet Circuit; hence, all of the secondary location's internet needs are self-sustaining.

We would like to leverage this 2nd location and Fiber Point to Point for a DR/Business Continuity plan.  

I asked the data provider if they can run a report on the bandwidth used from the fiber point to point and they told me that they do not have such a test for this model.  My question is:  How can we determine how strong or weak of a connection is on this Fiber Point To Point?

If we are to use this Fiber Point To point to replicate Data from 1 Location to the other we woud like to determine packet loss, dealy jitter, network latency, etc.

Does anyone have any suggestions regarding testing the strenth of the point to point in transfering data between 2 sites?  I have been told that IPERF is a good tool; but,i have found it difficult to learn and use.
0
Hi, I am renting rack space in two datacenters for hosting customers websites, and right now i have different customers hosted at each datacenter. I am getting IP allocations from my ISP and I use these for my customers websites. I have a /26 at each location. There is only one ISP (the same one) in the two datacenters, and it has two upstream connections to Tier-1 providers.

I wanted to establish a high speed private link between my two sites, so I can have high-availability and failover for my services such as the customer portal. The datacenter offers a 1Gb fiber circuit between the two sites.

My only layer3 devices at each location are Palo Alto firewalls (PA3050) and I only have a single ethernet hand off from the ISP (100mbps) connection for my internet connectivity at each location.

Can I run BGP in this setup? Or is there a better approach to achieve what I am looking to do? I am attaching a basic diagram.

After getting the BGP (or other routing protocol) working between the two sites, will this be considered a "dual homed" setup? (This will also help me apply for ARIN address space because now I have to use IPs from my ISP)

Diagram
I read that these Palo Altos can only run around 46,000 routes so I am not sure if I can use them for this setup?

Thank you
0
192.168.0.0/24 ...

I would like at least six CIDRs - please help guys
0
Wondering if anyone can help.

I have two sites connected via a IPsec Site to Site VPN connection using two ASA5510 firewalls.

On one Site (DC) I also have a second interface with a leased line and 3rd party router connected.

The internal network in DC needs to be Natd to 172.24.130.240/28 when accessing the 3rd party server on 195.110.246.119 which is done via dynamic policy nat in the firewall.

The DC internal network 10.50.9.0/24 can see/ping the the 3rd party router fine.

I want to know if it is possible for the anything on the other site network 10.50.1.0/24 to access the server using the Nat also.

I have spare routers that I can use each side if I need.

Diagram attached.

Thanks.Diagram of problem.
0
I have a URL published on Internet & this will be accessed via the Smart Tunnel of SSL VPN published in Cisco ASA.

When i access from Internet it works fine. But when I access it via by office LAN through proxy it is not working fine.

Would like to know to access the SMART tunnel VPN via proxy does any changes or any feature needs to be enabled in the proxy.
Does smart tunnel VPN works under proxy env & if so is there any document by which we can achieve this...
0
Looking for suggestion on where to start digging.  I'm having weird performance issues on the internet.  I been told that circuit is good by the carrier.  I've also confirmed that i'm not loosing/droping packets on the router.  So sometime I can go to a site and it runs fast and no issue other times it can take 10 minutes for it to come up.  

Any suggestion would be helpful.
0
Hi,

We have a 48 port D-Link 1210-48 port switch which is configured for three VLANs as follows:

VLAN 1 Internal - Ports 1 to 36 untagged
VLAN 2 Warehouse - Ports 37 to 44 untagged
VLAN 3 Public WIFI - Ports 44 to 47 untagged
Port 48 tagged for VLAN1 and VLAN2 and has Draytek 2710 router in it.

All VLANs working fine. There is a public router serving three access points plugged into port 47 and is working fine. Public users can access the Internet without issue.

The problem appears to be with the Draytek. We have VLANs enabled on it, P1 enabled for "VLAN0" which we understand is tagged across the network as 1, and "VLAN1" which we understand to be tagged as 2. P2, P3 and P4 are all taged as "VLAN3" as we understand that they need to be assigned to something. P1 is plugged into Port 48 on the switch.

The Draytek is set up for DHCP, but serves no IP addresses to the network, for either of the VLANs that it is supposed to. Also, if we assign a relevant static IP to one of the clients on either VLAN we cannot ping the Draytek. If we turn wireless on for the Draytek, we can connect fine to the Internet through a DHCP supplied address.

Does anyone know why we would have a problem with the VLAN setup? It all seems straightforward enough to configure but something just isn't right.

Thanks.
0
Looking for a ping tool which can be schedule on a server to collect connectivity report at differenct time of the day.

Thanks.
0
I have an unusual issue in that I have a Windows 7 Hyper-V virtual machine (IP address 10.0.1.10) and when I ping from that machine to one particular external IP address on the Internet the ping response replies successful from 10.0.1.10. Tracert returns with only the single response from the local machine. If I use tracert for addresses either side then it behaves as expected.

example tracert response - (the target addresses are obscured for obvious reasons but the xx.xx.2.130 address is real and can be pinged successfully from the firewall)

C:\Users\administrator>tracert xx.xx.2.130

Tracing route to xxxxx [xx.xx.2.130]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  NSO-VPBX.my-network.local [10.0.1.10]

Trace complete.

C:\Users\administrator>tracert xx.xx.2.129

Tracing route to vlan210-coresw-02.thn.as42004.net [xx.xx.2.129]
over a maximum of 30 hops:

  1     1 ms    <1 ms     1 ms  nso-fwl.my-network.local [10.0.1.254]
  2     4 ms     4 ms     4 ms  host-62-24-233-186.as13285.net [62.24.233.186]
  3     5 ms     5 ms     5 ms  host-78-151-238-17.as13285.net [78.151.238.17]
  4     6 ms     5 ms     6 ms  host-78-151-238-12.as13285.net [78.151.238.12]
  5     6 ms     6 ms     5 ms  host-78-144-9-169.as13285.net [78.144.9.169]
  6     6 ms     6 ms     5 ms  host-78-144-10-62.as13285.net [78.144.10.62]
  7     6 ms     6 ms     6 ms  linx-01.thn.as42004.net [195.66.224.45]
  8     *        *        *     Request timed out.
  9  …
0
Something got corrupt on a server and now we have to restore from a backup. However, because there are shares on this server, I have to make the comparison from the current state and the restored server. How do I run a command that will give me what shares are on this server and ACL?
0
I have a   2901k9 router that has the attached config.

My issue is  that is now does connect the vpn or indeed allow internet +web traffic into the local network..

stumped.

Thanks

Matthew
r1config.txt
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please can anyone advise me ...

I have a cisco 2901 router

subinterface 0/0

dot1q    1   ==  native vlan     192.168.11.1

dot1q     2   ==   voice vlan     192.168.22.1


I have a Ip sec  site to site vpn  mapped to  external  gig 0/1    47.x.x.23

how do I redirect  tcp ports 6200 & 554   to internal ip    192.168.11.170

 Thank you so much for helping

Regards

Matthew
0
i have a windows 2008 server with ip address of 10.214.19.113.  i have installed a printer with an IP ADDRESS given to me 192.168.57.21.  i cannot ping or tracert to this 192 ip address.  
how can determine where the issues is?
any help would be greatly appreciated.
i have included a snap shot of ROUTE PRINT, APR table.
the printer ip and gateway are as follows:

192.168.57.21
255.255.255.0
192.168.57.1


it seems like an ARP issue?
routeP.jpg
arp-q.jpg
0
Help understanding SPF record

Lets say my Internet domain is company.com

The zone file for company.com shows

@                       IN      TXT     "v=spf1 a mx include:abc.com include:_marketing.xyz.com ?all"

1. Does this mean that the SMTP servers at abc.com and _marketing.xyz.com are authorised to send emails for company.com?

2. If company.com authorised another 3rd party to send emails, do I just add another 'include:3rdparty.com' to the the SPF record?
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.