Ethernet Frame & 802.1Q VLAN Inspector
Ethernet Frame & 802.1Q VLAN Inspector: Parses Destination MAC (00:1A:2B:3C:4D:5E), Source MAC, TPID 0x8100 (802.1Q VLAN Tag), VID (100), and EtherType 0x0800 (IPv4).
About this ethernet frame & 802.1q vlan inspector
Ethernet Frame & 802.1Q VLAN Inspector — browser-based utility.
How this tool works
Implements client-side Ethernet Frame & 802.1Q VLAN Inspector operations. Parses Destination MAC (00:1A:2B:3C:4D:5E), Source MAC, TPID 0x8100 (802.1Q VLAN Tag), VID (100), and EtherType 0x0800 (IPv4) specifically designed for a network systems engineer dissects an ethernet ii frame with an 802.1q vlan tag.
- Protocol Message De-serialization: Parses raw DNS wire-format byte streams or HAR 1.2 JSON waterfall entries.
- Record Validation & Separation: Enforces RFC 6844 requirements that CAA authorization ('issue', 'issuewild') and reporting ('iodef') tags reside on separate records.
- Waterfall Timing Analysis: Sums network phases (blocked, dns, connect, ssl, send, wait, receive) to evaluate latency waterfalls.
- Visual Diagnostic Reporting: Renders color-coded waterfall timelines and highlights high-latency assets or missing HTTP caching headers.
Worked example
Scenario: Parse a 14-octet Ethernet II header locally.
Sample input:
Processing: Validate octets and extract MAC addresses, EtherType and header size.
Illustrative output:
Limits and verification
Rejects combined single-line CAA records that violate RFC 6844 syntax. In HAR file analysis, protects against multi-gigabyte log allocations by parsing entry streams with memory safety bounds.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the Ethernet Frame & 802.1Q VLAN Inspector workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
What frame fields does it actually parse?+
It splits hexadecimal octets on spaces, colons or hyphens, validates two hex digits per token, and returns destination/source MAC, EtherType, known protocol, bytes, headerBytes and payloadBytes. TPID 0x8100 or 0x88a8 reads one VLAN tag with PCP, DEI and VLAN ID.
Which controls and input limits apply?+
The page has one hexadecimal-frame text area, Run locally and Load sample. A non-VLAN Ethernet II header needs at least 14 octets; a VLAN-tagged frame needs 18. It does not capture a network interface, read a PCAP, decode IP payloads or construct packets.
How does Ethernet Frame & 802.1Q VLAN Inspector protect against invalid states or mathematical limits?+
Dissects raw Ethernet II frame hex byte strings, extracting destination and source MAC addresses, optional IEEE 802.1Q VLAN encapsulation tags (TPID, PCP, DEI, VID), and payload EtherType identifiers (IPv4, IPv6, ARP). Rejects frames shorter than 14 bytes (18 bytes with VLAN); it does not open raw network sockets.
What result does the worked example produce?+
In the worked example, the tool exactly matched the independent 14-octet broadcast/IPv4 vector. Separate guarded contracts matched a VLAN-42 IPv6 frame and the short-frame error. These prove local parsing of those values only; they do not prove traffic example run or network delivery.