--- title: Building a Small Network with ChatGPT « ipSpace.net blog description: A networking engineer tests ChatGPT's ability to generate Cisco router configurations for a simple four-router topology. The results are riddled with errors: a... canonical: https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Building a Small Network with ChatGPT « ipSpace.net blog | daily.dev og:description: A networking engineer tests ChatGPT's ability to generate Cisco router configurations for a simple four-router topology. The results are riddled with errors: a... og:url: https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop og:image: https://api.daily.dev/og/posts/zNcAGlYop.png og:image:alt: Building a Small Network with ChatGPT « ipSpace.net blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Building a Small Network with ChatGPT « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 5 min read · 0 upvotes · 0 comments ## Summary A networking engineer tests ChatGPT's ability to generate Cisco router configurations for a simple four-router topology. The results are riddled with errors: a missing link in router A's config, router D connected to nothing, router B lacking a loopback interface, overlapping /24 loopback subnets, and a chain of unnecessary static default routes. GPT-4 performs significantly better — all links present, correct subnet masks, smaller P2P subnets, and proper OSPF — but still not optimal. The conclusion is that ChatGPT output cannot be trusted without expert validation, making it useful only as a rough starting point for someone who already knows networking. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What mistakes does ChatGPT make when generating Cisco router configurations for a simple OSPF topology? ChatGPT commonly omits links it verbally describes (e.g., the A-D link missing from router A's config), leaves routers without loopback interfaces, assigns overlapping /24 subnets to loopbacks instead of /32s, and adds a chain of unnecessary static default routes. GPT-4 corrects most of these issues — all links present, proper subnet masks, smaller P2P subnets — but OSPF configuration is still not fully optimal. _Network engineers evaluating AI tools for config generation track real-world accuracy findings like these on daily.dev._ ## Similar posts on daily.dev - [My home lab dashboards were a mess until I let ChatGPT tie them together](https://daily.dev/posts/my-home-lab-dashboards-were-a-mess-until-i-let-chatgpt-tie-them-together-vaeyktrgn) · XDA Developers · 0 upvotes · 0 comments - [OpenAI ChatGPT fixes DNS data smuggling flaw](https://daily.dev/posts/openai-chatgpt-fixes-dns-data-smuggling-flaw-33yjya6he) · The Register · 1 upvotes · 1 comments --- Tags: [#llm](https://daily.dev/tags/llm), [#chatgpt](https://daily.dev/tags/chatgpt), [#cisco](https://daily.dev/tags/cisco) [View this post on daily.dev](https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Building a Small Network with ChatGPT « ipSpace.net blog","url":"https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop"},"datePublished":"2026-08-11T08:55:09.787Z","dateModified":"2026-08-11T09:02:48.132Z","description":"A networking engineer tests ChatGPT's ability to generate Cisco router configurations for a simple four-router topology. The results are riddled with errors: a...","image":"https://media.daily.dev/image/upload/s--OHB84bZF--/f_auto/v1722860399/public/Placeholder%2010","thumbnailUrl":"https://media.daily.dev/image/upload/s--OHB84bZF--/f_auto/v1722860399/public/Placeholder%2010","isAccessibleForFree":true,"articleSection":"ipSpace.net Blog","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ipSpace.net Blog","logo":"https://media.daily.dev/image/upload/s--xS7E82MT--/f_auto,q_auto/v1786438303/logos/ipspace?_a=BAMAMicg0","url":"https://daily.dev/sources/ipspace"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"llm,chatgpt,cisco","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ipSpace.net Blog","item":"https://daily.dev/sources/ipspace"},{"@type":"ListItem","position":3,"name":"Building a Small Network with ChatGPT « ipSpace.net blog"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/building-a-small-network-with-chatgpt-ipspace-net-blog-zncaglyop#faq","mainEntity":[{"@type":"Question","name":"What mistakes does ChatGPT make when generating Cisco router configurations for a simple OSPF topology?","acceptedAnswer":{"@type":"Answer","text":"ChatGPT commonly omits links it verbally describes (e.g., the A-D link missing from router A's config), leaves routers without loopback interfaces, assigns overlapping /24 subnets to loopbacks instead of /32s, and adds a chain of unnecessary static default routes. GPT-4 corrects most of these issues — all links present, proper subnet masks, smaller P2P subnets — but OSPF configuration is still not fully optimal. Network engineers evaluating AI tools for config generation track real-world accuracy findings like these on daily.dev."}}]} ```