Network Engineering Stack Exchange
Network Engineering Stack Exchange

Most Popular

more tags
1500 questions
7
votes
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…
Baldrick
  • 5,300
  • 7
  • 38
  • 79
7
votes
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…
Baldrick
  • 5,300
  • 7
  • 38
  • 79
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
  • 2,435
  • 1
  • 17
  • 34
7
votes
1 answer

How does the preamble synchronize other devices receiving clocks?

As I know the preamble of an Ethernet packet consists of a 56-bit pattern of alternating 1 and 0 bits. But how exactly it helps the other devices to be synced?
Malith
  • 185
  • 4
7
votes
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
  • 91
  • 2
7
votes
7 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
  • 205
  • 2
  • 8
7
votes
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
  • 538
  • 4
  • 18
7
votes
1 answer

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
  • 2,008
  • 4
  • 21
  • 37
7
votes
2 answers

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
  • 71
  • 1
7
votes
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
  • 831
  • 2
  • 12
  • 16
7
votes
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
  • 71
  • 1
  • 2
7
votes
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
  • 831
  • 2
  • 12
  • 16
7
votes
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
  • 71
  • 1
  • 2
7
votes
1 answer

Smallest IPv6 block advertised?

We've received a /48 allocation from ARIN, and want to advertise smaller blocks from different sites in our organization. I tried advertising a /56 from each site, but ISP is telling me they won't advertise anything smaller than a /48. So each…
Ron Trunk
  • 67,450
  • 5
  • 65
  • 126
7
votes
3 answers

Is IP address Subnet Renumbering needed here?

We have a router with NAT enabled on our edge. The NAT inside is 10.0.0.0/24. Now, we're running out IP blocks and we wish to change this to 10.0.0.0/22. We can do this quickly on the NAT router. But for the host devices, do we need to replace…
Marc_A
  • 123
  • 1
  • 1
  • 5
1 2 3
…
99 100