--- title: Why Is Source Address Validation Still a Problem? «... description: A brief pointer to a RIPE Labs article on IP Source Address Validation (SAV), covering its basics, best practices, and free testing tools to identify... canonical: https://daily.dev/posts/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Why Is Source Address Validation Still a Problem? « ipSpace.net blog | daily.dev og:description: A brief pointer to a RIPE Labs article on IP Source Address Validation (SAV), covering its basics, best practices, and free testing tools to identify... og:url: https://daily.dev/posts/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde og:image: https://api.daily.dev/og/posts/oltGKYcDE.png og:image:alt: Why Is Source Address Validation Still a Problem? « 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. # Why Is Source Address Validation Still a Problem? « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 1 min read · 0 upvotes · 0 comments ## Summary A brief pointer to a RIPE Labs article on IP Source Address Validation (SAV), covering its basics, best practices, and free testing tools to identify non-compliant networks. SAV is a MANRS-recommended action for improving internet routing security at the data-plane level. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is source address validation (SAV) and why is it recommended by MANRS? Source address validation (SAV) is a data-plane security technique that verifies whether the source IP address of a packet is legitimate before forwarding it. MANRS (Mutually Agreed Norms for Routing Security) lists SAV as one of its recommended actions for network operators to prevent IP spoofing and related attacks. Free testing tools exist to detect networks that are not compliant with SAV best practices. _Network engineers working on routing security track MANRS compliance and SAV developments on daily.dev._ ## Similar posts on daily.dev - [ASPA: making Internet routing more secure](https://daily.dev/posts/aspa-making-internet-routing-more-secure-r19ceuyg1) · Cloudflare · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security) [View this post on daily.dev](https://daily.dev/posts/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde) ```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":"Why Is Source Address Validation Still a Problem? « ipSpace.net blog","url":"https://daily.dev/posts/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde"},"datePublished":"2026-08-11T08:54:57.514Z","dateModified":"2026-08-11T09:21:51.392Z","description":"A brief pointer to a RIPE Labs article on IP Source Address Validation (SAV), covering its basics, best practices, and free testing tools to identify...","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/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security","timeRequired":"PT1M"} {"@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":"Why Is Source Address Validation Still a Problem? « ipSpace.net blog"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/why-is-source-address-validation-still-a-problem-ipspace-net-blog-oltgkycde#faq","mainEntity":[{"@type":"Question","name":"What is source address validation (SAV) and why is it recommended by MANRS?","acceptedAnswer":{"@type":"Answer","text":"Source address validation (SAV) is a data-plane security technique that verifies whether the source IP address of a packet is legitimate before forwarding it. MANRS (Mutually Agreed Norms for Routing Security) lists SAV as one of its recommended actions for network operators to prevent IP spoofing and related attacks. Free testing tools exist to detect networks that are not compliant with SAV best practices. Network engineers working on routing security track MANRS compliance and SAV developments on daily.dev."}}]} ```