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1500 questions
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votes
2 answers

Where is Ping's "round-trip time" stored in the IP header?

If we use ICMP's ping, we know the TTL and round-trip time are stored in the IP header. In the below IP header map we know TTL's location, but where is the round-trip time? Is it stored in Options?
aircraft
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3 answers

What is the difference between a VRF and VRF-Lite?

To the best of my knowledge, the concept of VRF is something that exists only in the Cisco World. Other vendors refer to this concept as VPN, which is in other words, a way to keep routing tables separated within a router. Knowing that what is the…
gaetano
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9
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2 answers

How does NAT work with incoming UDP packets from unknown IP

Apologies in advance for the relatively noob question and if this is off topic here ( I am not sure...) The situation is that I have a UDP client and server bound to the same port. My understanding of NAT is that UDP packets going out from the…
Sentinel
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9
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1 answer

Diffrence between "wr" and "copy running config to startup config"

For saving configuration in Cisco devices we have "wr" and "copy running config to startup config" i am curious what is difference between these two command.
R1w
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9
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3 answers

How do VPN's forward network traffic? (Layer 3)

I am looking for some info on how VPN's (Virtual Private Network) forward network traffic through its VPS (Virtual Private Server). Take an example where you are connected to a VPN. You make a request to a website, which then makes its way down the…
cg14
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9
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1 answer

Extra long ethernet, or similar technology, for kite

I just need to have a webcam and some equipment on a kite, running on Ethernet. But unfortunately the string will be more than 200 meters long so Ethernet will not work, (as far as I know). Transfer speed should be at least 10mbps. This is…
Prostitutor
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9
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1 answer

How to break apart an IPv6 /56 6rd delegated prefix from ISP into multiple /64 VLANs for use with SLAAC EUI-64? [Cisco]

I have CenturyLink Internet service, and they have a 6RD IPv6 deployment where they hand out an IPv6 delegated prefix /56 block to me and allow me to use it as I wish. My Cisco ISR router receives the /56 delegated prefix. I have multiple VLANs and…
OpenHorseSoftware
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9
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4 answers

Overcome 2 monitor session limitation in Cisco VSS

Is there a way to overcome Cisco's 2 monitor session limitation on a VSS 6500 without the use of a network tap?
henklu
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9
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2 answers

Label to Route mapping, Label generation scalability

In MPLS enabled routers, is a unique label generated per Destination prefix in routing Table or is it per Next-hop in the routing table if not both, how is the mapping between unique labels and routing table entry ? Also, if it is per Destination…
Hemanth
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9
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4 answers

What is the advantage of an "area" in OSPF configuration?

As we know, during OSPF configuration we use the area. Each area has its different number, while there is only one area (area 0) which creates communications between all other attached areas. I am confused that as we are using the same…
Fahim Shah
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1 answer

What path does a packet follow through a Cisco Nexus 5k/2k infrastructure?

I was told by someone that a packet going between two hosts connected to the same Nexus 2k would end up being passed all the way up to the 5k that is managing said 2k for logic to be applied and then passed back down to the 2k and out the port the…
PacketWrangler
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9
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1 answer

How does NAT Stitching work?

While reading about CISCO NetFlow Analysis I came up with a term named NAT Stitching. I understand Flow Stitching which join same type of inbound and outbound connection. But can't find anything discrete about NAT Stitching except the following,…
arif
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9
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2 answers

NAT and UDP problems

I have a question regarding NAT, UDP and TCP. Given a standard NAT server, is it a problem for it that UDP is connectionless? If so, why? And does TCP or QUIC solve this problem?
chimi
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9
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5 answers

Static redistribution into EIGRP as internal failure

I am redistributing a static route into EIGRP on a 6500. I had read here if you enter a network statement matching a static route that it would be redistributed as an internal route by EIGRP. However, after entering the configuration, neighbors…
henklu
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9
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2 answers

Is there anything stopping me from using Class A addresses on my own network?

I've been reading about IPv4, networking, subnetting and the different classes of addresses. I understand that IP addresses beginning with numbers from 1 to 126 are considered "Class A" addresses. However suppose I created a private network for my…
CodyBugstein
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