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1500 questions
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2 answers

How is the payload distributed across Multilink PPP connections

A site I support uses 3 T1s setup with multilink PPP. They are trying to use Jive which is a hosted VoIP provider, with horrible results. I want to know how packets are distributed between the individual T1s since I think this may help explain…
Zoredache
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3 answers

Is a TCP three-way handshake required for an HTTP POST?

I don't quite understand if i posting http form data from the browser to the server, does the protocol still need to make three-way handshake (syn-ack-data) or it only works for GET http requests?
Елена Кокчева
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13
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2 answers

Who pays for traffic when it transits multiple providers

TLDR Question: Who pays for traffic when it transits multiple providers Original Question I know there are a great many sites out there with this question and answer, but as yet I have not been able to understand them. If I am in CT and want to…
user1122069
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What is the difference between a VRF and GRF? (cisco)

I've heard about VRF's and GRF's, but was is the difference between those 2? (cisco)
Bulki
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13
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2 answers

How NAT / PortForwarding / TCP/IP works?

I recently read an article entitled how NAT works. Some things still remain unclear to me. I would be thankful if someone could explain. Below is the part of the article regarding DynamicNAT that is most confusing: A computer on the stub domain…
user2449761
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13
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3 answers

VLAN and subnet relationship

Many have pointed out that a VLAN can hold one or more subnets. If your default gateway for this subnet is on a router or a L3 switch then how could there be more than one default gateway in a VLAN configuration? On a router you map each…
Michael May
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13
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4 answers

Is a wireless only network (for end users) a viable option?

We are constructing a new building, and our CIO is pushing for a solution where he doesn't have to spend the money on copper runs to all the user stations and wants to use wireless only for this purpose, especially since wireless will already be…
YLearn
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12
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3 answers

Migrating pre-8.3 ASA config to 8.3+

What are best practices migrating ASA config to 8.3 and forward? I have manually created a new config file with the following changes: new network objects new NAT statements new access-lists referencing network objects My next steps would be to…
Rowell
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12
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2 answers

Technical difference between a Collision and Broadcast Domain

Many people new to networking wonder what the technical differences between a broadcast domain and a collision domain are. Specifically: What criteria is used to know the boundaries of a collision domain? Why does an ethernet switch break up a…
Mike Pennington
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12
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2 answers

traceroute many hops with the same ip

I'm a software developer that sometimes has to do some easy network tasks but knows almost nothing about it. I'm having some problems with a vps I rent ( ENJOY VPS: Unmanaged VPS - Medium VPS) and they insist that their server is running ok, but I…
Luis Zavaleta
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12
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4 answers

Which specs should I look for (or avoid) when searching for a iSCSI 10Gbit ethernet switch, independent of brand?

I've been tasked with selecting two new switches intended to be our new iSCSI SAN backbone. Currently, we are using two Dell N4064 improvised for the task since that's what we had when the need arrived, but now we are going to replace them with two…
ÜM Mineiro
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12
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1 answer

ASA5505 and IPv6 over a PPPoE Link

I see a lot of conflicting information about whether or not a Cisco ASA (5505 in this case) can use IPv6 over a PPPoE connection. I see official Cisco documentation making it look easy, but I see plenty of forum posts stating that it doesn't…
Mark Henderson
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12
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1 answer

Cisco ISR G2 encrypted bandwidth restriction?

I have been having complaints of a "slow connection" from several new remote sites. The sites are connected via an MPLS L3VPN service into Cisco 2921's, and we are using Cisco GET-VPN to encrypt the traffic between our locations. All locations…
Brett Lykins
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12
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1 answer

Mac / CAM entries from non-Cisco switches with Q-BRIDGE-MIB

How do I do community string Indexing for other switches like D link DES 3526 and Brocade Fastiron SX800? I am running a java program to poll a specific vlan on a Brocade sx 800 l3 switch. The program throws a "Time out error". I then checked the…
Abhishek Balaji R
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12
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4 answers

Can anyone explain to me the difference between the PSH and URG flags in TCP segment?

According to me when PSH flag is set, it indicates that data will have to be sent immediately to the wire and on receiving side the data has to be pushed to the application immediately. When URG flag is set it indicates that urgent data has to be…
user10433098
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