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fix(console): switch ser2net accepter to telnet(rfc2217) for proper NVT

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The original ser2net config used raw TCP accepters, but conman's
dev="host:port" speaks telnet protocol. This protocol mismatch caused
conman's telnet NVT state machine to strip bare CR characters from
device output — particularly from Dell switches that send \n\r (LF+CR)
line endings — producing stair-stepped and garbled terminal display.

Fix: change ser2net accepter from `tcp,IP,PORT` to
`telnet(rfc2217),tcp,IP,PORT`. With both sides speaking telnet, binary
mode is negotiated and CR/LF translation is handled correctly by the
telnet NVT layer. RFC2217 also enables baud rate negotiation for
future use.

Validated at the byte level: PTY capture confirms all prompts render
cleanly at column 0 with proper CRLF handling across 5+ Enter presses.
All 7 consoles connected, 7 log files actively capturing.

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Assisted-by: Crush:glm-5.2
This commit is contained in:
mrcharles
2026-07-29 19:35:05 -05:00
parent 51db52f862
commit 25a7234f40
3 changed files with 15 additions and 11 deletions
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docs/docmap.md
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@@ -47,7 +47,7 @@ Server provisioning, security hardening, DNS/NTP configuration.
| [`../netinfra/dhcp-migration.md`](../netinfra/dhcp-migration.md) | DHCP migration: pfv-netboot → netinfra-01/02 (ISC failover-peer, COMPLETE) | 2026-07-29 |
| [`../awx/README.md`](../awx/README.md) | Ansible AWX deployment on tsys-awx (k3s + AWX Operator 2.19.1, v24.6.1) | 2026-07-29 |
| [`../powerman/README.md`](../powerman/README.md) | Cyclades PM10i PDU management via powerman on pfv-tsys1 | 2026-07-28 |
| [`../console/README.md`](../console/README.md) | Serial console management (conman direct-serial) for 7 network switches on pfv-tsys4 | 2026-07-29 |
| [`../console/README.md`](../console/README.md) | Serial console management (ser2net telnet rfc2217 + conman) for 7 network switches on pfv-tsys4 | 2026-07-29 |
| [`../k8s/README.md`](../k8s/README.md) | k3s cluster setup scripts: wipe, bootstrap, taint, verify (3-node HA over Tailscale) | 2026-07-28 |
| [`../dns-cluster-setup/README.md`](../dns-cluster-setup/README.md) | Technitium DNS cluster setup: export, deploy, cluster, verify | 2026-07-28 |
| [`../tests/README.md`](../tests/README.md) | Test suite documentation: unit, security, validation tests | 2026-07-28 |