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);

Select all Open in new window

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?

Env: Cisco Nexus 9508 with an 10Gbase-LR SFP connecting to the carrier. For the last few days the interface has been racking up input errors and CRC. Hundreds ever few seconds. We've replaced the SFP and we replaced the fiber from the SFP to the patch panel.

What trouble-shooting methods do I have my disposal once the carrier gets on site? I've had these maddening all night affairs where the vendor says "we're all clean to our next device in Deluth (or wherever). Besides replacing optics, shutting/no shutting the interface, what other tools would help to isolate the cause of these errors? Thank you.

(BTW A tech at the data center tried to throw us a loop but the interface went down from UDLD. If there's a way to make a hard loop to us more informative that would be good to know too)

I am setting up our infrastructure to enable remote phones on a new phone system we installed. The phone vendor requirements were fairly simple, port forward UDP 443 to a device on our DMZ(the virtual machine). Easy, or so I thought.



Everything looks good from the Firewall end. If I plug in the phone, I can see the traffic hit the firewall, and be forwarded to the device lets say is 11.11.11.11. No issues I can see from the firewall end. It's a Barracuda NG F280, I have gone over it over and over with Barracuda support and they see nothing from their end.



The issue is that traffic never hits 11.11.11.11. I have set up a monitoring VM on my DMZ with wireshark, never see the traffic. The VM has a packet monitor built in so I can create packet captures on the interface directly, never see the traffic. If I run a netcat cmd for UDP 443, I see nothing. I see other traffic. If I ping 11.11.11.11 from anywhere else on the network, I see it. There is nothing between this device and the Firewall, except the VMWare hypervisor.



I am at a loss at this point. My Firewall vendor says it isn't on their end, my phone vendor says it isn't on theirs. I believe that to be the truth, but I don't know what else it could be. Does anyone have any ideas? Only thing I can think of is something in VMWare, but I have never seen VMWare block traffic like that before.

Some more info:

Seems localized in some way to port number. If I change my forwarding rule to port 3300 instead…

Spanning tree and working production environment.

Greetings, my work place has spanning tree and I have limited experience with Spanning tree.  I was charged with setting up new Wireless controllers and to route internet only traffic through a specific "Internet Only" VLan.  I have setup the configuration how the vendor suggested.  Basically:

- Create DHCP scope and assign the DHCP Gateway to a VLAN on the controller (created for the Guest VLan).  
- Then create a Vlan for Internet Only and assign an IP address to that VLAN(From the DHCP Scope).  
- Then assign that Internet Only VLAN to an available untagged port on the Wireless Controller.
- The assign an available IP address from the Internet only VLAN on teh wireless controller.
- Then connect that port (0/0/3) to the Internet Only VLAN with its own separate connection.

The problem, is that the Wireless controller is showing that port 0/0/3 is blocking.  Port 0/0/3 is the port connected to the Internet Only VLan.

Port Status
-----------
Slot-Port  PortType  AdminState  OperState  PoE  Trusted  SpanningTree  PortMode  Speed   Duplex  PortError
---------  --------  ----------  ---------  ---  -------  ------------  --------  -----   ------  ---------
0/0/0      GE        Enabled     Down       N/A  Yes      Disabled      Trunk     Auto    Auto    -
0/0/1      GE        Enabled     Up         N/A  Yes      Forwarding    Trunk     1 Gbps  Full    -
0/0/3      GE        Enabled     Up         N/A  Yes  …

I had this question after viewing Stuck in INIT/DROTHER.

I have the same problem? OSPF INIT/Drother between Cisco Switch L3 and Cisco Firewall ASA?
I checked everything all the configuration.It looks good however it doesn’t work? I don’t really understand why?

Hi Experts,

     I want to configure elasticsearch to a new IP address.  Currently, it is on a dev machine.  But I want to configure to a new IP address.

currently, in my elasticsearch.yml the current settings are

network.host:0.0.0.0

path.data : /var/lib/elasticsearch

path.logs: /var/logs/

inside /var/lib/  elasticsearch is link file to links to /mnt/elasticsearch

I want to install elasticsearch to new machine.  machine ipaddress is eg., 5*.25*.22*.1*,  

My questions are,

Do I have to install elastic search on this new IP address,

or can I set this new IP address as network.host path in the existing dev machine?

or do I have backup and restore to the new ipaddress?

Please suggest how to configure?

I had tried changing the network host to the new IP address, and copied elasticsearch folder to the new machine and set the path to path.data and I had set path.logs to new machine folder paths and restarted elastic search from the existing dev machine.

elastic search failed to start.

Please suggest how to configure the elastic search on this new machine.

With many thanks,

Bharath AK

I have router on a stick fa0/0.10 10.10.10.1/30 on R1 and an IP address assigned to R2 f0/0 10.10.10.2/30. I am trying to understand why I cannot ping R2 from R1?


R1 config:

interface FastEthernet0/0
 no ip address
 duplex full
!
interface FastEthernet0/0.10
 encapsulation dot1Q 10
 ip address 10.10.10.1 255.255.255.252
!

Select all Open in new window

R2 config:

interface FastEthernet0/0
 ip address 10.10.10.2 255.255.255.252

Select all Open in new window

What's the best way to setup Cisco 3850 switches by copying configs over the new one. 2 identicals are already in place.  
The additional will server same functions as access switches.

How STP influence the Traffic

on the diagram below, PC2 is connected to  Switch SW3 that has a blocked port on the link to SW1. Now Traffic from PC2 to PC1 will it go from SW3 to SW2 then to SW1 or it stiil can go straight from SW3 to SW1 then to PC1

Thank you

DR(designated router) is for sending source message to receiver. I am not sure DR is located between source and RP, or between RP to receiver? Anyone can give some idea? Thank you

Interface Multilink Vs Interface Virtual Template on Cisco Routers

I would like to know the difference between using the commands :
Interface Multilink Vs Interface Virtual Template

it looks like they achieve the same thing.

Any idea ?

Thank you

I want to check my network and see if certain ports and protocols are already allowed through the firewall, is there a windows  tool that I can use to verify this before I poke on the firewall?

Thank you,

when I do a pptp VPN from my network over an ATT router I get this error only on my windows 10 devices (1 desktop and 2 laptops) via WiFi and via Hardline. my 1 win7 desktop has no issues and when I put the win10 devices on a different network (my hotspot) the VPN goes through with no issues. any ideas?

I've already tried disabling the win10 stations local firewall and that did not help.