5
votes
3answers
664 views

Can internet gateways be plugged straight into a layer 2 switch?

tl;dr Internet gateways (eg., cable modems, fiber optic gateways) don't function properly when they aren't behind a device with "layer 3" or routing capabilities, correct? Incredibly long backstory ...
1
vote
0answers
88 views

Inter-server connectivity loss after applying cisco switch configurations

I have 2 Redhat servers in cluster. The eth0/eth2 ports on both servers are in bond0(which is assigned IP). The eth0 and eth2 from server1 are physically connected to giE0/3 on switch1 and 2 ...
6
votes
0answers
77 views

Why do I need to assign static ip address to the bridge and not to the physical interface? [duplicate]

I have bond0 with two physical interfaces in it. Normally I used to assign static IP address to this bond0 to set up internet connectivity on the server. Now, because of LXC virtual guests, I had to ...
0
votes
3answers
519 views

Connect to cisco switch using shell script

I would like to run a daily script the cleans my switch arp. I enabled SSH on my switch. how do I connect to the switch using a simple shell script? I'm not sure how to provide the SSH password and ...
1
vote
2answers
3k views

Need help setting up an HP Procurve 2650 switch via serial using Linux.

I recently bought an HP Procurve 2650 (J4899A) off ebay and it came out without a serial cable. So I also purchased a null modem serial cable (rs232) to connect to it (Assuming this is the right one). ...
2
votes
3answers
733 views

Is it possible to capture packets of a Router?

I am facing an issue that some packets sent out to internet from inside network were missing. The pattern we are using is like: Client A ←→ Switch A ← Router A:NAT ← .. Network .. → Router ...
1
vote
1answer
279 views

Setup Network with two ISP

Currently I have a network with 1 ISP, a router/modem, Gigabyte Switch and a server. All the clients PC are automatically assign IP from DHCP server from a Router/Modem A. Server A have a fixed IP ...
4
votes
1answer
259 views

Linux server reboot brings down LAN network

I have a strange problem in my office network. I have a physical server which runs ESXi 4. Every time I reboot a linux virtual machine (Ubuntu Server 12.04.1 LTS) the entire LAN network goes down. ...
0
votes
2answers
203 views

Linksys SE1500 Ethernet switch issue

I just bought a Linksys SE1500 Ethernet switch and I'm trying to set up a small standalone network for pentesting and security research. However, when I do a network scan with one of the computers ...
0
votes
1answer
100 views

webserver behind router or switch, multiple IPs available

We are getting a new internet connection 100Mbps UP/DOWN and 4 Static IPs. Also on that connection there will be a webserver that hosts some websites for us. (Nothing too fancy). The problem where ...
6
votes
1answer
2k views

Is bonding mode=5 a solution against MAC flapping?

There is two are interconnected Cisco WS-2950T. By the one GBIC port on first switch connected a first NIC of bonding interface, and by the one GBIC port on second switch connected a second NIC of ...
0
votes
2answers
214 views

About the MAC table on switches?

I'm learning the network basics at my university this semester. I had a question on the mid-term exam and unfortunately ,I answered it wrong. I have a final exam about an hour from now, and I still ...
0
votes
2answers
467 views

set PROMISC mode for switch in Linux

How do I set the promisc mode on for a switch. I have two SW like below: root@chandler:~# brctl show bridge name bridge id STP enabled interfaces br0 ...
7
votes
2answers
739 views

Linux Router Problem

I have a Linux based router with four interfaces (each with its own private subnet). When I directly connect a device directly (i.e. no switch, just a patch cable) to one interface and another device ...
1
vote
2answers
531 views

Linux bridge redundancy

I make heavy use of Linux Bridges (brctl) as I have a Xen environment. At the minute, only one physical NIC is connected to the bridge (There are many virtual NICs for the Xen VMs though). In order to ...
2
votes
2answers
921 views

snmpd configuration to enable BRIDGE-MIB or Q-BRIDGE-MIB

All the Ethernet switches and access points on my network provide snmp access to the bridge learn table except for my linux-based bridge. Does net-snmp support exporting the bridge forwarding ...
0
votes
4answers
4k views

Choosing 10GbE switch: 10Gb uplink module on 1GbE switch means it can act at 10Gb bandwidth?

confused between choosing a switch with 10Gb ports vs 1Gb layer3 switch which has optional 10Gb uplink port. are they same? that means I want to have a 10Gb pipe between storage server and the two ...
2
votes
2answers
305 views

Network not working properly - 3 computers working, 3 not working - what could it be?

So I've got this setup ... Fiber cable broadband connection -> Media Converter -> Switch (8 ports) -> PCs The network does not have DHCP, all settings are manual. 3 computers can connect to the ...
0
votes
3answers
336 views

Connecting Linux system to switch from 2 interfaces

To get proper redundancy, we've installed 2 switches in our network and connected them to eachother. We now want to hook our servers to both switches. Since all servers have 2 ethernet ports, this ...
0
votes
3answers
77 views

Connecting Linux system to switch from 2 interfaces [duplicate]

Possible Duplicate: Connecting Linux system to switch from 2 interfaces To get proper redundancy, we've installed 2 switches in our network and connected them to eachother. We now want to ...
5
votes
3answers
2k views

Getting Started with NIC and Switch Redundancy

Currently with my servers, they all or almost all have 2 nics with one in use. Each NIC is is of course connected to a single switch. What do I need to do to make this redundant in that both NICs ...
0
votes
1answer
747 views

vlans and Linux NAT on one NIC

I'm using a Linux server to do iptables NAT routing for a small business network. We also have a 24port managed switch that will be providing connections for all the wall ethernet jacks. The layout ...
3
votes
3answers
14k views

How can I fix a bad arp entry?

I'm just guessing that arp is my problem... I have a linux drbd server cluster set up, and due to some power issues had to unplug the switch that connects the two servers. As a result, both servers ...