All Questions
1
vote
1answer
4 views
NX-OS peer-switch issues with 6500 VSS
I'm bringing up a new pair of Nexus 5500s running NX-OS 5.2 and I'd like to make use of the new vPC Peer Switch feature:
The Virtual Port Channel (vPC) peer switch feature addresses performance ...
2
votes
0answers
25 views
Redundancy between router and servers
In the past, I was using a NetGear GS724T between my router and my servers. Unfortunatly the switch suddenly died.
Now I've changed it for a GS748T and also bought one more and I am wondering how I ...
3
votes
1answer
29 views
Cisco 2901 - Determine if bundled T1s are up based on bandwidth?
I have a Cisco 2901 at a remote branch office connected via ge0/1 to an Adtran that is managed by TW Telecom with 8 T1s bundled together for an MPLS circuit.
I don't have access to the Adtran gear, ...
5
votes
3answers
68 views
BGP signalled MPLS issues
I am having an issue getting a VPLS up using an ME3600x with 15.3(2) and BGP signalling.
@yelfathi and @packettalk have pointed me down the correct route but not sure how to resolve it.
I have 2 ...
3
votes
0answers
25 views
Is CoS supported in a logical system?
This reference states that class of service is supported in a logical system, but another reference disagrees. This may be a disparity between versions, but I have notoiced there is no class of ...
3
votes
0answers
32 views
VM on a client connected to a Cisco 1262 unable to DHCP (but IPv6 works fine)
I recently replaced wireless at a site from the internal AP on an 877-WM with a (standalone) 1262 running 15.2(2)JB. I've configured the AP pretty much the same as I always do for Cisco AP's for ...
5
votes
1answer
42 views
VPN Connection: Can ping printer but not server what is blocking things?
I have a VPN set up between several offices. All but one work fine. With one office, I can ping the printer 192.168.45.30 but not a server 192.168.45.242. Well, I say I can't but when the server was ...
6
votes
1answer
48 views
pfSense multi-wan Bridge, NAT, Load balancing and CARP
Context
I currently have :
1 pfSense 2.0.2 router (on a Firebox X-Peak X5000)
2 WAN
1 LAN
3 Servers
My interfaces
WAN1 68.XX.XXX.98 to 69.XX.XXX.102
WAN2 65.XXX.XXX.58 to 66.XXX.XXX.62
LAN ...
6
votes
3answers
147 views
Traffic Policing
I know traffic policing isn't something that you normally find in a LAN environment, and I wish I wouldn't be finding it in mine. That being said... I have no choice.
The device is a 3750X. The ...
2
votes
1answer
61 views
Isolating Juniper Management Plane
Out of the box, it seems that the Juniper management routing is part of the default route table. Can I use logical systems to isolate the service plane from management routing? Are there any ...
2
votes
3answers
106 views
Is a router always necessary to link two subnets?
I am thinking especially of VLANs, which represent separate subnets that may need only one switch.
4
votes
3answers
97 views
Where to properly put the DHCP server?
In a network that's being designed to provide wireless and wired access in a library, where there will be more or less 50 users at the same time...
Where would be better to handle the DHCP requests? ...
-1
votes
1answer
78 views
Practical uses for a new switch [closed]
Ok, I'm kind of a network newbie, at least from an enterprise perspective. Lots of theory and course work, little hands on. I've got a small two enclave network, and someone handed me an excess ...
9
votes
2answers
114 views
load balance between two ISP bgp links
I have up-links to two separate ISPs on one router and receive a default route from each via BGP. Both links are the same speed and BGP is used only to advertise our prefixes out. Whats the best way ...
8
votes
3answers
78 views
How does one specify certain IPs or MAC addresses for NBAR policy enforcement?
In an office environment, if I wanted to block youtube using a Cisco ISR router, I would set up the following with NBAR:
class-map match-all YOUTUBE
match protocol http host "*youtube.com*"
!
...
2
votes
2answers
56 views
Difference between MSC-A, MSC-B and FP-40
What's the difference between
MSC-A
MSC-B
FP-40
on a CRS-1 8-S?
6
votes
1answer
56 views
Does SCTP work over the Internet?
I am working on an application that would be able to take advantage of the multi-streaming features of SCTP.
Does SCTP work across the Internet? Is it supported by ISP's routers and consumer routers ...
2
votes
2answers
54 views
Setting the same gateway address at a DR site as our main site
I have a question about routed traffic across a site to site VPN between 2 Cisco ASA 5510's. We have our office side and our DR side and the question is could I have an IP conflict of gateway IP ...
4
votes
1answer
69 views
Migrating from PIX/VPN 3000 to ASA
In a project to replace the last Cisco PIXes and VPN 3000 Concentrators we have [finally], I've already spec'd out the new ASA 5515-X and 5545-X's. I have no experience with the X models; only exp ...
-1
votes
1answer
64 views
Secure communication to external host [closed]
I work for a big company.
For some reasons we want to install a special kind of Wifi-Router in a test environment which has to communicate to an external host outside the company over port 9032.
...
-4
votes
0answers
47 views
what is a good diagram for simulating a whole picture of network in dynamips or GNS? [closed]
would like to make a network having redundancy switching network, EIGRP, OSPF, DMZ, VPN in one simulation to be like a real world practice for a company
bonus is for tuning practice and performance ...
9
votes
3answers
194 views
What is the meaning of RSSI?
When using mobile 3G routers, you see in the output of the "show cellullar 0 all" command. What is the significance of this value? Is this interpretation the same when talking about 2G or 3G?
Ex:
...
4
votes
1answer
76 views
BGP expanded community-list regex
I need to verify that the following regex will match against my criteria, which is:
Deny any prefixes beginning with 0:
Deny any prefixes beginning with 65000:
Deny any prefixes beginning with ...
5
votes
1answer
35 views
Configure External Interface for DHCPv6 client on Cisco IOS
What are the necessary steps to configure IOS 12.4(25f) to support IPv6? Comcast is the ISP, and I'll be using a Server 2012 box for internal DHCPv6.
I'll need to grab a DHCPv6 address from Comcast ...
0
votes
0answers
35 views
Rate Based Satellite Control Protocol [closed]
Has anyone ever experimented with Cisco's RBSCP?
Rate Based Satellite Control Protocol
There is very little blogs and POC's using this GRE protocol and I am curious if anyone has come across it.
...
5
votes
2answers
42 views
802.3x ethernet flow-control on user ports?
What is the best practice for putting 802.3x flowcontrol on a userport and does this inhibit performance if the application/system isn't designed for it?
Eg)
interface gig0/1
flowcontrol receive ...
6
votes
3answers
69 views
Setting up DHCP server on the router or on the switch?
We're using the Cisco 1921/K9 with a SG300 L3 switch. Does one set up DHCP server on the router or on the SG300? If both is capable, what is the reason to choose one over the other?
Note: I have 4 ...
4
votes
1answer
54 views
How to find a duplicate router-id ospf in the network?
Hi I've got a problem in the network with a duplicate OSPF router-id. We tipically use the loopback ip address as the router-id, but I'm afraid that someone in the network don't care about that.
I ...
6
votes
9answers
241 views
Locate a host on Network
What is the best method of locating a particular workstation on a VLAN ?
I sometimes need to do this, if a workstation IP address, shows up on an ACL Deny
torrent use
High bandwidth usage (Top ...
5
votes
1answer
80 views
Why have all my lab routers set their OSPF priority to 0?
I have 4 routers in my lab. FR1 is the frame relay switch (2621), R1(2621), R2(2651) & R3(2651) are all connected in a mesh using sub interfaces - R1 has pvc to R2&R3 and so on. Without OSPF I ...
5
votes
2answers
75 views
Does 2504 WLC support LAG?
I am finding some contradictions in Cisco documentation about the LAG support in 2504 WLC. On one hand, the Cisco 2500 Series Wireless Controller Deployment Guide clearly states:
Note: Link ...
3
votes
1answer
44 views
What functionality does 802.3bd-2011 actually add to 802.3 Ethernet?
Looking for various documents and the IEEE standards, I can see that 802.3bd-2011 adds a MAC control frame for priority-based flow control. How does priority-based flow control differ from IEEE ...
5
votes
1answer
39 views
Blocking IPv6 RA advertisements on Juniper EX series switch
How do I go about blocking IPv6 RA advertisements on access ports on a Juniper EX series switch? I know that Cisco offers ra-guard as an option much like bpdu-guard on spanning tree, I am just not ...
2
votes
2answers
85 views
How do the Application, Presentation and Session layers of the OSI model map to TCP/IP's Application Layer and vice versa?
I need to map TCP/IP protocols to the OSI model for some university test revision I am doing.
I was wondering if it is generally acceptable to assume any OSI Level 7, 6 and 5 protocol will be ...
6
votes
4answers
147 views
Website filtering via IOS
Our office network uses the 1921/K9 router along with SG300 L3 switch (and a few other L2 switches) all with base modules. If we wanted to block employees from visiting certain websites, what would be ...
3
votes
4answers
111 views
USA proxy IP in a box [closed]
My boss, US expat, is requesting a solution to watch his US TV shows and other content while he is staying here (small European country you probably never heard of). As I think, the ideal solution ...
1
vote
2answers
82 views
IPv6 address range [closed]
The number of address for IPv6 is (2^128). However, this does not define the number of unique devices that are addressable. There are certain class of address that are reserved, for instance the link ...
12
votes
6answers
205 views
Ethernet termination density per rack and space planning
I am in the process of designing the network for a new office space. To give a little bit of background...
There will only be one network closet to start with potential for an IDF in the future. This ...
-2
votes
0answers
81 views
Best Practice SNMP [closed]
What is industry standard when it comes to SNMP? Are there different things to be monitored for switches, routers and firewall or is it all about the same? What is the critical information I should ...
8
votes
1answer
92 views
Firewall Replication
If I have two datacenter sites that are considered redundant to each other. Is it possible to sync firewall configuration from the primary to the backup? What is the best way to keep both firewalls ...
-2
votes
0answers
42 views
Weird Website Connect Problem [closed]
I manage three websites for my boss and work from her office. For some reason, those three websites keep giving me an error when I'm in the office, but nowhere else. It will get really slow and then ...
9
votes
1answer
119 views
How can I check to see if I am receiving MED's?
I have a BGP session with a transit provider in two different cities. We are both using the same AS at both locations. I am expecting them to be sending me MED's for me to use for routing decisions ...
7
votes
1answer
94 views
Cisco IOS built-in SSH client default version
You issue the command ssh 192.168.97.97 from a IOS device and the destination IOS router/switch SSH server is accepting both SSH versions. Being that you did not specify a version to use on the SSH ...
12
votes
3answers
382 views
What happens when 2 computers transmits at the same time to a 3rd one in a full duplex switch?
Consider the following scenario:
I have 2 PC's (PC1 and PC2) that wants to transmit at the same time to PC3 in a full duplex ethernet switch. Let's consider that all ports are in the same VLAN, so ...
14
votes
4answers
851 views
Why does ipv6 specify 128 bit address, when there are only 48 bits in MAC addresses?
So, I'm reading for a networking exam, and I'm just wondering if I have missed something basic. Is there a need for more ip addresses than MAC addresses, and how would a node with one network adapter ...
10
votes
3answers
143 views
Why we get high fluctuation on bandwidth measurement Cacti graph?
We were on redundancy test of Etherchannel and Routing on our network. During this intervention we made some measurement. Our monitoring tool is Cacti for graph.
The equipment monitored is a 4500-X ...
-1
votes
1answer
75 views
Accurate approch for LAN Speed Test [closed]
Respected one,
Please guide me what would be the best approach to check the Network Speed(Uploading & Downloading Speed) within a LAN network (Which also have connectivity to Internet).
-1
votes
1answer
46 views
Getting large data into stream processing engine [closed]
I've been reading some documents on the current state-of-the-art stream processing engines (or complex event processing - CEP - engine). Those systems aim at keeping the data moving through the system ...
4
votes
2answers
103 views
upgrade RAM on a Cisco ASA 5520
I understand the risks of using third party ram but paying for the Cisco branded memory modules and CF cards on an old ASA which is no longer covered but Smartnet is ludicrous.
There are plenty of ...
4
votes
1answer
106 views
Passive Network Monitoring Software [closed]
What are some good passive network monitors aside from Wireshark that can be used for analyzing OSPF traffic? In particular, I would like to be able to inspect the routing table and link-state ...
