Claude, Anthropic's AI assistant, has gained a strong following among engineers for its precise reasoning and large context window. Sysadmins use it to analyze BGP configurations, debug VPN policies, and work through complex firewall rule logic — exactly the kind of structured reasoning where Claude performs well.

The credential problem is identical to any other AI assistant. When you paste a network config into Claude, that text goes to Anthropic's servers. Your live VPN pre-shared keys, admin passwords, API tokens, and SNMP community strings go with it.

ScrubForge solves this: sanitize the config locally in Chrome, then paste the clean version into Claude with no live credentials attached.

Why Sysadmins Use Claude for Network Configs

Claude handles dense, structured text well. A 1,500-line FortiGate config or a multi-vRF Cisco IOS-XR export is within its context window — Claude can analyze it as a complete document rather than a truncated snippet.

Common use cases where Claude adds value:

Claude also supports long, back-and-forth troubleshooting sessions where you can share additional context incrementally — useful when the initial analysis surfaces follow-up questions.

The Credential Risk Is the Same

Claude's context window doesn't change the underlying privacy issue. When you submit a message to Claude (claude.ai, the API, or any Claude-powered product), the text goes to Anthropic's infrastructure. Depending on account type and usage settings, it may be retained for abuse review, safety monitoring, or product improvement.

A production firewall config with live credentials doesn't belong on any external server — regardless of the AI assistant you're using.

The ScrubForge + Claude Workflow

The sanitization step takes under a minute. The rest of the workflow is identical to what you'd do with any AI assistant.

Step 1: Export your running config

Use your standard method: show running-config on Cisco IOS, get system config on FortiGate CLI, or a configuration export from your management UI.

Step 2: Open ScrubForge

Click the ScrubForge icon in your Chrome toolbar. The extension opens locally — nothing is uploaded at this step.

Step 3: Paste and sanitize

Paste the raw config. ScrubForge detects passwords, pre-shared keys, API tokens, private keys, and SNMP strings — replacing each unique value with a consistent placeholder token like [PSK_1] or [ADMIN_PASS_1]. The network topology, routing configuration, and policy structure remain intact.

Step 4: Review the output

Spend 30 seconds scanning for anything that looks like a live credential. ScrubForge covers 120+ patterns across 12 vendors, but a quick review before sharing is good practice.

Step 5: Paste into Claude with context

Open Claude, describe your problem, and paste the sanitized config. Because the structure is preserved, Claude can reason about the full logical layout without ever seeing your actual credentials.

Example prompt:

"Here is a sanitized Cisco IOS config (credentials replaced with placeholder tokens — network structure is intact). My site-to-site IPsec tunnel to 198.51.100.10 drops every 6 hours and doesn't automatically recover. Can you identify likely causes from the config?"

What Claude Does Well With Sanitized Configs

Claude's strengths map well to network troubleshooting tasks:

Large config analysis. Claude can handle a full export — not just a snippet — which matters when the bug is in the interaction between policies rather than one isolated block.

Structured reasoning. Claude tends to explain why something is wrong, not just flag it. Useful when you need to understand the root cause rather than just apply a fix.

Iterative sessions. You can follow up with additional context ("here's what changed in the last 48 hours" or "here's the output of show ip bgp summary") within the same conversation. The sanitized config from step 1 remains as the reference point.

Multi-vendor configs. If you're troubleshooting a path that crosses a Cisco router, a FortiGate firewall, and a Palo Alto, you can paste multiple sanitized configs into one session and ask Claude to look for cross-device inconsistencies.

Using Claude Projects for Ongoing Config Analysis

Claude's Projects feature lets you organize related conversations under a shared context. For network troubleshooting, this means you can add a sanitized baseline config to a project once and reference it across multiple sessions — without re-pasting it each time.

The same rule applies: only add sanitized configs to a Project. A Project is still cloud-hosted. A sanitized config with placeholder tokens is safe to store there; a raw config with live credentials is not.

Before and After: What the Sanitized Config Looks Like

A fragment showing what Claude receives after ScrubForge runs:

--- BEFORE (raw) ---
crypto isakmp key MyS3cr3tK3y address 203.0.113.5
username admin password 7 0822455D0A16
snmp-server community C0mmun1ty! RO
ip vrf MGMT
 rd 65001:100

--- AFTER (sanitized by ScrubForge) ---
crypto isakmp key [PSK_1] address 203.0.113.5
username admin password 7 [ENC_PASS_1]
snmp-server community [SNMP_RO_1] RO
ip vrf MGMT
 rd 65001:100

The peer IP address, routing identifier, and VRF name stay in place. Claude sees the full logical structure with no live credentials.

Related Guides

Frequently Asked Questions

Does ScrubForge work the same way with Claude as with ChatGPT? Yes. ScrubForge sanitizes locally regardless of which AI assistant you use afterward. The sanitization step is identical — paste config, scrub credentials, copy clean output. Where you paste that output is up to you.

Claude has a large context window — does that help with big configs? It helps. Claude can ingest a complete, multi-thousand-line config without requiring you to truncate it. This is useful when the issue spans multiple sections of a large configuration file. Sanitize the full export and paste it whole.

Can I use Claude Projects to store a sanitized config for reference? Yes, and it's a reasonable workflow for ongoing infrastructure work. Add the sanitized config as a context file in a Project. Because credentials are replaced with tokens, it's safe to store in a cloud-hosted Project. Storing a raw config there would be the equivalent of emailing it in plaintext.

Does Anthropic train on my Claude conversations? Anthropic's data handling policies vary by plan and API usage. Check the current Anthropic privacy policy for specifics. For sensitive configurations, the safest approach is to ensure credentials never reach the server in the first place — which is what ScrubForge handles.

Is the free version of ScrubForge enough for this workflow? The core sanitization feature works for free — paste a config, get a sanitized version with credentials replaced by tokens. The Pro version adds custom dictionary import/export, context profiles for different vendor types, and unlimited saved replacements.