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1500 questions
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2 answers

ARP Questions (Packet Types, Ethernet, Cache, Gratuitous)

Lately I have been doing some research on the Address Resolution Protocol, and even though I know the idea behind it I still have some questions. Q1: Are there more types of ARP messages that I am missing aside the following?: ARP Request ARP…
Christian Veenman
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2 answers

Enabling flow control on my ethernet NIC

When running "ethtool eth0", I get a line in the output that states -> Supported pause frame use: No Does this mean my Ethernet card does not support flow control at all? I try to enable the flow control with "ethtool -A eth0 rx on tx…
user_ABCD
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7
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4 answers

How can I avoid having to change the vlan back and forth when imaging pc's

We are using PXE boot to image computers from Win XP to Windows 7. The powers that be have created an imaging vlan dedicated specifically for this purpose, presumably for load balancing? The problem is that once that image is finished, we have to…
Keven Culp
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2 answers

Cisco ASA 8.4(3); NAT multiple ports on public IP to private IP

I have the following configuration on an ASA running 8.4 already; object network SERVER-01 host 192.168.0.1 ! object network SERVER-01 nat (Inside,Outside) static interface service tcp 3389 5001 I have this config repeated several times to allow…
jwbensley
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2 answers

How to configure OOB access via IP

Single Cisco IOS device in a remote DC, I have an OOB connection delivered into the rack (length of Cat5e into my rack from another onsite providers rack, who have diverse routes from my own, in and out of the building) which is simply a L3…
jwbensley
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7
votes
2 answers

RPKI in the Enterprise

What is the concensus on the use case for RPKI? Is it useful for a stub AS to perform route validation or is this better left to the providers?
Dennis Olvany
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7
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3 answers

IP Address vs MAC Address, how does that really work together illustration

My question is simple, i don't really know if I understand it so I'm asking. Why do we have both addresses, if we know the ip address of the target and source computer, why do we need some physical address? I've had this question so I have googled…
epixo
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7
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6 answers

Redundant IP link aggregation for failover operation without route failure detection

I am looking for a technology to achieve TCP connection fault tolerance with the help of two links between hosts and without time delays for route failure detection. Something like this: link1 packet1copy1-> …
Sergey Ushakov
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7
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3 answers

Can I run FCoE over Cisco Catalyst 5500?

I have 2 spare older Cisco Catalyst (not Nexus) 5500 switches. Would I need any additional hardware in order to run Fibre Channel over Ethernet (FCoE) over them? Do I need some kind of management device and/or software or can I do that internally?…
VMEricAnderson
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Is possible to configure a Cisco 881 by DHCP?

I'm wondering if is possible to configure a Cisco Router 881 from a file on a tftp instruct on a DHCP option. I know is possible to configure the wan port through DHCP by configuring "ip address dhcp" but what I search is there is a way to act as an…
cgasp
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VLAN clarification

I've inherited a network with approximately 200 computers and no VLANs configured. We are currently adding a system that uses multicasting to communicate with each other and will be adding VoIP in 2 years. I'd like to set up VLANs, with which I…
Wendy
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2 answers

ASA IPS issue: routing and management interface

We have management network (192.168.25.0/24) where we have management ip of ASA 5525-X IPS Bundle (.250) and IPS (.37). The IPS has a default gateway of our Layer 3 (.1) switch that is behind the ASA (according to Cisco's docs). To pass traffic…
Эдуард Буремный
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7
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2 answers

Load Balance NIC, Switch and Router (Redundancy)

I have two questions which I will separate to avoid confusion. I intend to build a network based on redundancy. There will be two pieces of every device, sometimes more than 2 such as NIC cards. I drew up this picture for you. As you can see I…
KenBeanNet
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3 answers

Flow Control: to be or not to be?

We deploy two 3750-X switches in stack and connect Dell Storage to 10G-T ports. Dell recommends to use flow control on this ports, but some people have a lot of problems with this feature (packet loss, traffic blocking). So, is it best practise to…
Эдуард Буремный
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7
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5 answers

PAT and Static NAT not working together?

The HQ network is using PAT to gain access to the internet, the internal webserver needs to be accessed from the internet using static NAT. Configs: S_HQ ! interface FastEthernet0/1 switchport access vlan 10 ! interface FastEthernet0/2 …
Thom
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