#Autoconfiguration DHCP issue

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Autoconfiguration DHCP IPv4 issue

Autoconfiguration DHCP IPv4 issue

Have you installed a new Server OS or Windows OS and when you assign a static IP, then attempt connecting to the internet but says “no internet”? Then you run a command to check the IP (Start >Run > cmd > ipconfig) and see your static IP and auto configuration IP showing a 169.x.x.x address?

This simply means that the DHCP client service is running in the background and attempting to receive…

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Cisco Certified Network Associate (200-125) Network Fundamentals Compare and contrast OSI and TCP/IP models Compare and contrast TCP and UDP protocols Describe the impact of infrastructure components in an enterprise network Firewalls Access points Wireless controllers

Describe the effects of cloud resources on enterprise network architecture Traffic path to internal and external cloud services Virtual services Basic virtual network infrastructure

Compare and contrast collapsed core and three-tier architectures Compare and contrast network topologies Star Mesh Hybrid Select the appropriate cabling type based on implementation requirements Apply troubleshooting methodologies to resolve problems Perform and document fault isolation Resolve or escalate Verify and monitor resolution Configure, verify, and troubleshoot IPv4 addressing and subnetting Compare and contrast IPv4 address types Unicast Broadcast Multicast Describe the need for private IPv4 addressing Identify the appropriate IPv6 addressing scheme to satisfy addressing requirements in a LAN/WAN environment Configure, verify, and troubleshoot IPv6 addressing Configure and verify IPv6 Stateless Address Auto Configuration Compare and contrast IPv6 address types Global unicast Unique local Link local Multicast Modified EUI 64 Autoconfiguration Anycast LAN Switching Technologies Describe and verify switching concepts MAC learning and aging Frame switching Frame flooding MAC address table Interpret Ethernet frame format Troubleshoot interface and cable issues (collisions, errors, duplex, speed) Configure, verify, and troubleshoot VLANs (normal/extended range) spanning multiple switches Access ports (data and voice) Default VLAN Configure, verify, and troubleshoot interswitch connectivity Trunk ports Add and remove VLANs on a trunk DTP, VTP (v1&v2), and 802.1Q Native VLAN Configure, verify, and troubleshoot STP protocols STP mode (PVST+ and RPVST+) STP root bridge selection Configure, verify and troubleshoot STP related optional features PortFast BPDU guard Configure and verify Layer 2 protocols Cisco Discovery Protocol LLDP Configure, verify, and troubleshoot (Layer 2/Layer 3) EtherChannel Static PAGP LACP Describe the benefits of switch stacking and chassis aggregation Routing Technologies Describe the routing concepts Packet handling along the path through a network Forwarding decision based on route lookup Frame rewrite Interpret the components of a routing table Prefix Network mask Next hop Routing protocol code Administrative distance Metric Gateway of last resort Describe how a routing table is populated by different routing information sources Admin distance Configure, verify, and troubleshoot inter-VLAN routing Router on a stick SVI Compare and contrast static routing and dynamic routing Compare and contrast distance vector and link state routing protocols Compare and contrast interior and exterior routing protocols Configure, verify, and troubleshoot IPv4 and IPv6 static routing Default route Network route Host route Floating static Configure, verify, and troubleshoot single area and multi-area OSPFv2 for IPv4 (excluding authentication, filtering, manual summarization, redistribution, stub, virtual-link, and LSAs) Configure, verify, and troubleshoot single area and multi-area OSPFv3 for IPv6 (excluding authentication, filtering, manual summarization, redistribution, stub, virtual-link, and LSAs) Configure, verify, and 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advertisement using Network command only) Describe basic QoS concepts Marking Device trust Prioritization Voice Video Data Shaping Policing Congestion management Infrastructure Services Describe DNS lookup operation Troubleshoot client connectivity issues involving DNS Configure and verify DHCP on a router (excluding static reservations) Server Relay Client TFTP, DNS, and gateway options Troubleshoot client- and router-based DHCP connectivity issues Configure, verify, and troubleshoot basic HSRP Priority Preemption Version Configure, verify, and troubleshoot inside source NAT Static Pool PAT Configure and verify NTP operating in a client/server mode Infrastructure Security Configure, verify, and troubleshoot port security Static Dynamic Sticky Max MAC addresses Violation actions Err- disable recovery Describe common access layer threat mitigation techniques 802.1x DHCP snooping Nondefault native VLAN Configure, verify, and troubleshoot IPv4 and IPv6 access list for traffic filtering Standard Extended Named Verify ACLs using the APIC-EM Path Trace ACL Analysis tool Configure, verify, and troubleshoot basic device hardening Local authentication Secure password Access to device Source address Telnet/SSH Login banner Describe device security using AAA with TACACS+ and RADIUS Infrastructure Management Configure and verify device-monitoring protocols SNMPv2 SNMPv3 Syslog Troubleshoot network connectivity issues using ICMP echo-based IP SLA Configure and verify device management Backup and restore device configuration Using Cisco Discovery Protocol or LLDP for device discovery Licensing Logging Timezone Loopback Configure and verify initial device configuration Perform device maintenance Cisco IOS upgrades and recovery (SCP, FTP, TFTP, and MD5 verify) Password recovery and configuration register File system management Use Cisco IOS tools to troubleshoot and resolve problems Ping and traceroute with extended option Terminal monitor Log events Local SPAN Describe network programmability in enterprise network architecture Function of a controller Separation of control plane and data plane Northbound and southbound APIs

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[technewsroom-blog]

Life structures of a hole: how iPhones spill the ID of systems they get to Yes, iPhones and other Apple gadgets routinely do uncover the unique.

An Ars story from not long ago detailed that iPhones uncover the one of a kind identifiers of as of late got to remote switches, which produced no lack of peruser shock. What conceivable legitimization does Apple have for building this spillage capacity into its whole line of remote items when cell phones, portable PCs, and tablets from contenders don't? What's more, how could it be that Google, Wigle.net, and others escape with distributing the MAC locations of a huge number of remote get to gadgets and their exact geographic area?

A few perusers needed more specialized insight about the presentation, which applies to three get to focuses the gadgets have most as of late associated with. Some ventured to challenge the legitimacy of security analyst Mark Wuergler's discoveries. "Until I see the code running or if nothing else a youtube I don't trust this person has the products," one Ars analyst composed.

As indicated by infiltration analyzer Robert Graham, the discoveries are genuine.

In the administration of our perusers, and to show to doubters that the protection break is genuine, Ars moved toward Graham and approached him to survey the article for precision and freely affirm or expose Wuergler's discoveries.

"I can affirm all the specialized points of interest of this 'hack,'" Graham, who is CEO of Errata Security, told Ars through email. "Apple items do in reality convey three bundles that will uncover your home switch MAC address. I affirmed this with my most recent iPad 3."

He gave the picture at the highest point of this post as evidence. It demonstrates a screen from Wireshark, a well known bundle sniffing program, as his iPad associated with an open hotspot at a Starbucks in Atlanta. Milliseconds after it associated with a SSID named "attwifi" (as appeared in the segment marked #1), the iPad communicated the MAC address of his Linksys home switch (appeared in the segment named #2). In segment #3, the iPad sent the MAC address of this switch a moment time, and inquisitively, the identifier was steered to this get to point despite the fact that it's not accessible on the neighborhood organize. As is clear in area #4, the iPad likewise uncovered the nearby IP address the iPad utilized when getting to Graham's home switch. The majority of this data is generally easy to see by anybody inside radio range.

The picture is reliable with one given by Wuergler underneath. Similarly as Wuergler first asserted, it demonstrates an iPhone unveiling the last three get to focuses it has associated with.

Graham utilized Wireshark to screen the same Starbucks hotspot when he associated with his Windows 7 portable PC and Android-based Kindle Fire. Neither one of the devices uncovered any beforehand associated MAC addresses. He likewise checked on several other non-Apple gadgets as they associated with the system, and none of them uncovered already got to addresses, either.

As the information clarifies, the MAC locations were uncovered in ARP (address determination convention) bundles promptly after Graham's iPad related with the get to indicate however earlier it getting an IP address from the switch's DHCP server. Both Graham and Wuergler theorize that Apple builds purposefully incorporated this conduct with their items as a method for accelerating the procedure of reconnecting to get to focuses, especially those in professional workplaces. As opposed to sitting tight for a DHCP server to issue an IP address, the presentation of the MAC addresses enables the gadgets to utilize a similar address it was doled out last time.

"The subject of is identified with DHCP and autoconfiguration (for speed and less movement on the wire)," Wuergler told Ars. "The Apple gadgets need to decide whether they are on a system that they have already associated with and they send unicast ARPs out on the system keeping in mind the end goal."

To be sure, strikingly comparable conduct was depicted in RFC 4436, a 2006 specialized reminder co-composed by designers from Apple, Microsoft, and Sun Microsystems. It talks about a technique for recognizing system connection in IPv4-based frameworks.

"For this situation, the host may decide if it has re-connected to the sensible connection where this address is substantial for use, by sending a unicast ARP Request bundle to a switch already known for that connection (or, on account of a connection with more than one switch, by sending at least one unicast ARP Request parcels to at least one of those switches)," the report states at a certain point. "The ARP Request MUST utilize the host MAC address as the source, and the test hub MAC address as the goal," it says somewhere else.

Obviously, just Apple architects can state without a doubt if the MAC revelation is deliberate, and agents with the organization have declined to examine the issue with Ars. In addition, if RFC 4436 is the purpose behind the conduct, it's vague why there's no proof of Windows and Android gadgets doing likewise. On the off chance that distinguishing beforehand associated systems is such a smart thought, wouldn't Microsoft and Google need to outline their gadgets to do it, as well?

As opposed to the discoveries of Graham and Wuergler were those of Ars essayist Peter Bright, who watched distinctive conduct when his iPod touch associated with a remote system. While the Apple gadget exposed a MAC address, the extraordinary identifier had a place with the Ethernet interface of his switch as opposed to the MAC address of the switch's WiFi interface, which is the identifier recorded by Google, Skyhook, and comparable databases.

Brilliant guessed that numerous corporate systems likely carry on a similar way. Also, for Apple gadgets that associate with get to focuses with such designs, introduction of the MAC address may posture to a lesser degree a risk. Still, while it's hazy what rate of remote switches allocate an alternate MAC deliver to wired and remote interfaces, Graham and Wuergler's tests demonstrate that in any event some remote switches as a matter of course make no such refinement.

Wuergler additionally exposed a couple of different misguided judgments that a few people had about the remote conduct of Apple gadgets. In particular, he said claims that iPhones don't communicate the SSID they are searching for from Errata Security's Graham are off base. A few Ars perusers had conjured the 2010 blog entry from Graham to give occasion to feel qualms about Wuergler's discoveries

"Actually Apple items do test for known SSIDs (and no, there is no restriction regarding what number of)," Wuergler wrote in a post distributed on Friday to the Daily Dave mailing list. He incorporated the accompanying screenshot to report his claim.

Drawing an obvious conclusion

What the greater part of this implies is that there's justifiable reason motivation to trust that iPhones and other Apple items—in any event when contrasted with gadgets running Windows or Android—are exceptional in spilling MAC addresses that can interestingly distinguish the areas of systems you've associated with as of late. At the point when consolidated with other information regularly uncovered by for all intents and purposes every single remote gadget—particularly the names of remote systems you've associated with previously—an assailant in closeness of you can gather this data and utilize it in focused assaults.

Over the previous year or somewhere in the vicinity, Google and Skyhook have found a way to make it harder for snoops to mishandle the GPS data put away in their databases. Google Location Services, for example, now requires the accommodation of two MAC addresses in closeness of each other before it will uncover where they are found. Much of the time, this necessity can be fulfilled just by giving one of the other MAC addresses returned by the Apple gadget. In the event that it's inside a couple pieces of the first, Google will promptly give the information. It's likewise possible for assailants to utilize war dialing systems to delineate MAC locations of remote gadgets in a given neighborhood or city.

Since Apple architects are staying mum, we can just think about why iDevices carry on the way they do. What isn't in question is that, not at all like several contending gadgets that Wuergler and Graham have inspected, the Apple items spill association points of interest numerous clients would like to keep private.