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This alternative addresses IPv6 addressing link-local scope and prefix rules, not the specific issue of Ping, traceroute and staged path isolation: Inspect `ip -6 addr`, `ip -6 route`, router advertisements and a scoped ping6 to the link-local destination.

That option would inspect and configure the appropriate `nmcli device wifi` and connection profile settings with approved authentication, secrets and autoconnect preferences, but it addresses a different concern. IP-layer echo reachability and hop-by-hop TTL diagnostics can locate routing failures but may be affected by ICMP filtering and do not guarantee application success.

This shortcut is unsafe for the present Linux issue: Treat the first traceroute asterisk as conclusive proof that the corresponding router is physically down and every higher-layer service is broken. IP-layer echo reachability and hop-by-hop TTL diagnostics can locate routing failures but may be affected by ICMP filtering and do not guarantee application success.

This alternative addresses IPv4 CIDR network masks and subnet reachability, not the specific issue of DNS query tools and authoritative versus recursive answers: Calculate network and host ranges from the prefix length and configure correct address, subnet prefix and route or gateway for remote destinations. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

That option would use `ip link` and `ip addr` to examine and adjust temporary interface state and repair the persistent manager configuration where required, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

That option would assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This alternative addresses TCP versus UDP versus ICMP diagnostics, not the specific issue of DNS query tools and authoritative versus recursive answers: TCP, UDP and ICMP have different roles; UDP does not inherently acknowledge or reorder delivery and ICMP ping behavior does not establish application TCP availability. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

That option would assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer, but it addresses a different concern. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This alternative addresses Hostnamectl and durable host identification, not the specific issue of DNS query tools and authoritative versus recursive answers: A transient hostname change is not necessarily persisted; hostname resolution and the configured system hostname are related but distinct functions. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. It cannot establish a safe correction.

That option would inspect `ip -br link`, `ip address show`, carrier state and manager logs before and after a controlled interface activation, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

That option would inspect interface addresses and routing, compare to the exact RFC1918 CIDR ranges, and test external source visibility where permitted, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This alternative addresses TCP versus UDP versus ICMP diagnostics, not the specific issue of DNS query tools and authoritative versus recursive answers: The selected transport matches reliability requirements and diagnostics distinguish blocked ICMP from a reachable TCP service. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This alternative addresses NetworkManager persistent wired connection profiles, not the specific issue of DNS query tools and authoritative versus recursive answers: The intended profile reconnects after a restart with the correct address, gateway and DNS while unrelated devices remain intact. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

That option would assume UDP automatically retries dropped packets and that failure of ping always means every TCP application on the destination is unreachable, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

That option would assume /26 means the first 26 hosts belong to one network and that all addresses with the same first three dotted-quad octets are local, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

That option would use only a transient `ip addr add` command and expect NetworkManager to persist it automatically after every reboot, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

That option would inspect and configure the appropriate `nmcli device wifi` and connection profile settings with approved authentication, secrets and autoconnect preferences, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This alternative addresses Ip command address and link troubleshooting, not the specific issue of DNS query tools and authoritative versus recursive answers: Use `ip link` and `ip addr` to examine and adjust temporary interface state and repair the persistent manager configuration where required.

This alternative addresses Linux routing tables and default gateway selection, not the specific issue of DNS query tools and authoritative versus recursive answers: Routing chooses destination paths from installed route prefixes and metrics; a correct local interface address alone does not establish off-link connectivity. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This alternative addresses Ip command address and link troubleshooting, not the specific issue of DNS query tools and authoritative versus recursive answers: The iproute2 command changes and reports kernel interface state, while durable settings are managed by the host's networking service. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. It cannot establish a safe correction. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. It cannot establish a safe correction. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This alternative addresses Hostnamectl and durable host identification, not the specific issue of DNS query tools and authoritative versus recursive answers: Inspect `hostnamectl status`, /etc/hostname, /etc/hosts and `getent hosts` output before and after reboot.

That option would inspect available SSIDs, connection authentication settings, device state, connection activation logs and effective routes, but it addresses a different concern. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This alternative addresses Well-known TCP UDP port mapping, not the specific issue of DNS query tools and authoritative versus recursive answers: Required traffic uses only documented service ports and protocols while irrelevant exposure stays blocked. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This alternative addresses IPv4 CIDR network masks and subnet reachability, not the specific issue of DNS query tools and authoritative versus recursive answers: On-link hosts are identified correctly and off-link traffic follows the planned gateway without spurious local ARP attempts. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This alternative addresses Linux routing tables and default gateway selection, not the specific issue of DNS query tools and authoritative versus recursive answers: Inspect `ip route` and selected `ip route get`, then set or repair the appropriate default route in the active manager or with `ip route` for a controlled temporary change. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration. Appropriate response: Use dig or host to test chosen DNS servers explicitly and separately verify normal resolver lookup through getent and local client settings. Root-cause evidence: Compare `dig name`, `dig @server name`, `host name`, `getent ahosts name` and the resolver settings. Independent acceptance: The application's normal lookup resolves the intended name from the approved resolver with no split-horizon mismatch.

This alternative addresses Hostnamectl and durable host identification, not the specific issue of DNS query tools and authoritative versus recursive answers: Inspect `hostnamectl status`, /etc/hostname, /etc/hosts and `getent hosts` output before and after reboot. Linux principle: A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.

This shortcut is unsafe for the present Linux issue: Assume success from `dig @8.8.8.8` guarantees every local application uses that same server and returns the same answer. A direct DNS query to a named server tests that server, while application resolution follows local NSS, caching and resolver configuration.