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ipspace net blog ipspace net blog ic_menu_white home blog resources technology resources articles software gone wild podcast books videos netlab examples automation examples aws and azure examples ansible examples events and conferences interviews labs build a virtual lab bgp configuration labs is is configuration labs network automation public cloud data center about ipspace net ivan pepelnjak webinar and course authors expertexpress team company information contact log in friday august 28 2026 07 26 0100 using netlab in software testing with dinesh dutt i know a few software development companies use netlab to test their network management software and contribute back to netlab thanks a million and i always wanted to chat about that as i have known dinesh dutt for ages it wasn t hard to decide who to invite to have that chat with as it turns out it s dangerous to put dinesh 1 and me in the same virtual room we were all over the place from the ancient history of vagrant in networking labs to the recent ansible woes but we did manage to cover how netlab helps stardust systems test new suzieq features read more add comment software gone wild podcast netlab thursday august 27 2026 07 30 0200 yak shaving netlab podman support long long time ago in a long forgotten pr adding support for cumulus vx ignite runtime an off the cuff remark was made saying and this is how you use netlab with podman that remark was quietly sitting in the documentation for years until someone a tried to use podman and b found enough time to report that it doesn t work with netlab i don t know what that tells us either very few people use podman or nobody apart from a notable exception cares enough to spend a few minutes telling us stuff doesn t work 1 anyway based on joey buiteweg s wonderful research i was able to put together a working solution pretty quickly but it did involve a lot of yak shaving more bovine details read more add comment netlab wednesday august 26 2026 07 55 0200 dear junos tunnels are not virtual links in late june we added gre tunnels to netlab including a junos implementation it looked great as in everything worked until i changed the integration tests to have gre tunnels between a tested device and a pair of frr containers all other implementations worked as before but junos failed to establish an ospfv3 adjacency over the gre tunnel with frr stefano sasso quickly identified the culprit junos ospfv3 process thinks it should send the dbd packets over gre tunnels with mtu set to zero the behavior reserved for virtual links 1 read more see 2 comments ospf netlab tuesday august 25 2026 07 44 0200 multivendor sr mpls summer is almost over and it s time to resume regular programming with the next example from the segment routing workshop i had at itnog10 multi vendor sr mpls i used the same lab topology as in the previous examples but deployed arista eos on pe1 frrouting on p and sr linux on pe2 1 read more add comment sr mpls netlab monday august 24 2026 07 20 0200 arista ceos does not apply acls to control plane traffic when someone starts singing the use digital twins to test your network hymn or more recently tells you how ai agents can do that to validate their ideas ask them about these minor details if they persist point them not that it would help to this long list of gotchas that list just got longer arista ceos container does not apply inbound acls to control plane traffic arista veos vm does read more add comment security netlab thursday august 20 2026 07 56 0200 worth reading reading the git crime scene tony mattke continues publishing excellent git for networking engineers content in his latest article he described how to find who made what changes and why in a git repository absolutely worth reading if you re new to git but even oldtimers might find a few useful tidbits git is one of those things one never truly masters add comment worth reading wednesday august 19 2026 08 24 0200 worth reading on ai coding and its discontents a lot of ai coding enthusiasts are making claims along the lines of ai coding tools are like compilers you supply intent they translate it into code and who ever looked at the machine code output unfortunately there is a bit of a gap between hope and reality traditional compilers were always deterministic and are after decades of development and bug fixing pretty much bug free ai coding tools are neither and no amount of agentic loops will solve that read more add comment worth reading ai tuesday august 18 2026 07 16 0200 exploring the bgp neighbor connect state sakar left an interesting comment on my the curious case of the bgp connect state blog post claiming that cisco ios xe goes through a connect state when opening an incoming bgp session i wanted to double check this behavior so i needed a scenario where one router would keep sending tcp syn requests the other would not or we wouldn t learn anything and the two routers could not communicate or they d quickly go into the open state here s my first attempt at meeting those requirements read more see 2 comments bgp monday august 17 2026 08 02 0200 the never ending ipv6 loopback prefix saga remember the sage advice to simplify your life and use the ipv6 64 prefixes everywhere not only does it make your life simpler and wastes immesuarably less address space than the crazy let s assign 64 to every device stupidity it also reduces the hardware requirements in your high speed routers layer 3 switches you see doing lookups on 64 bits uses half the silicon it takes to do lookups on 128 bits alas some people never got the memo ospfv3 standard clearly states in one of the bullets in section 4 4 3 9 that the loopback prefixes should always be advertised as 128s regardless of what s configured on the interface read more add comment ipv6 thursday august 13 2026 08 07 0200 worth reading llm prompts for network engineers tony mattke put together a long list of recommendations that might help you get more out of your llm tokens definitely worth reading instead of yelling at the stupid ai see 2 comments worth reading page 1 of 436 older posts sidebar follow us featured high availability disaster recovery distributed systems high availability solutions high availability in private and public clouds high availability service clusters high availability switching site and host multihoming network automation ci cd in networking cli versus api intent based networking build virtual labs with netlab network infrastructure as code single source of truth ssot in network automation routing and routing protocols anycast resources bgp articles bgp in data center fabrics dhcp relaying ospf articles unnumbered ipv4 interfaces software defined networking openflow basics software defined wan sd wan the openflow sdn hype what is sdn switching and bridging integrated routing and bridging irb designs interfaces and ports mpls and mpls vpn details multi chassis link aggregation qos mechanisms other resources ai and ml in networking dynamic multipoint vpn dmvpn enhanced interior gateway routing protocol eigrp ethernet vpn evpn locator id separation protocol lisp networking fundamentals open shortest path first ospf routing protocol segment routing with mpls labels sr mpls segment routing over ipv6 srv6 public videos on ipspace net more popular posts the never ending ipv6 loopback prefix saga exploring the bgp neighbor connect state dear junos tunnels are not virtual links technology resources on acls and ai generated device configurations worth reading llm prompts for network engineers compress netlab lab topologies with dot notation on the futility of opening ansible issues multivendor sr mpls arista ceos does not apply acls to control plane traffic see more blog archive 2026 132 august 2026 13 july 2026 8 june 2026 20 may 2026 19 april 2026 19 march 2026 19 february 2026 20 january 2026 14 2025 205 december 2025 13 november 2025 21 october 2025 21 september 2025 21 august 2025 11 july 2025 12 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december 2014 13 november 2014 21 october 2014 24 september 2014 26 august 2014 20 july 2014 16 june 2014 23 may 2014 21 april 2014 18 march 2014 21 february 2014 20 january 2014 20 2013 241 december 2013 15 november 2013 18 october 2013 24 september 2013 24 august 2013 22 july 2013 16 june 2013 19 may 2013 24 april 2013 24 march 2013 17 february 2013 20 january 2013 18 2012 177 december 2012 9 november 2012 17 october 2012 16 september 2012 10 august 2012 18 july 2012 15 june 2012 10 may 2012 15 april 2012 13 march 2012 19 february 2012 19 january 2012 16 2011 234 december 2011 15 november 2011 24 october 2011 22 september 2011 21 august 2011 21 july 2011 13 june 2011 17 may 2011 20 april 2011 19 march 2011 19 february 2011 21 january 2011 22 2010 213 december 2010 22 november 2010 19 october 2010 19 september 2010 22 august 2010 23 july 2010 18 june 2010 21 may 2010 14 april 2010 19 march 2010 20 february 2010 8 january 2010 8 2009 158 december 2009 13 november 2009 15 october 2009 14 september 2009 9 august 2009 9 july 2009 13 june 2009 17 may 2009 16 april 2009 15 march 2009 18 february 2009 10 january 2009 9 2008 180 december 2008 13 november 2008 15 october 2008 18 september 2008 17 august 2008 16 july 2008 12 june 2008 14 may 2008 10 april 2008 11 march 2008 18 february 2008 18 january 2008 18 2007 183 december 2007 9 november 2007 20 october 2007 15 september 2007 15 august 2007 16 july 2007 8 june 2007 16 may 2007 17 april 2007 16 march 2007 19 february 2007 16 january 2007 16 2006 34 december 2006 8 november 2006 7 october 2006 16 september 2006 1 august 2006 2 recent tags netlab 346 worth reading 288 ai 64 sr mpls 25 software gone wild 125 security 257 ospf 114 bgp 366 ipv6 244 ansible 3 other tags data center 632 automation 375 sdn 347 design 267 virtualization 267 ip routing 229 switching 223 fabric 190 cloud 183 openflow 145 wan 138 high availability 131 networking fundamentals 126 overlay networks 126 internet 112 bridging 111 mpls 104 network management 101 vxlan 101 firewall 99 evpn 99 mpls vpn 89 ansible 78 qos 76 load balancing 69 eem 57 command line interface 57 lan 56 dmvpn 56 dhcp 54 certifications 53 sd wan 53 is is 43 tcl 40 configuration 34 vmotion 34 access control 33 service providers 32 san 31 aws 31 web 30 traffic engineering 30 nsx 30 http 26 eigrp 26 scalability 26 ppp 25 nat 25 azure 24 dns 23 tcp 23 fcoe 22 link aggregation 22 aci 21 arp 20 ipsec 20 humor 20 vpn 19 containers 19 logging 18 lisp 18 cumulus linux 18 cef 17 trill 17 intent based networking 16 show filters 15 syslog 14 clnp 12 what went wrong 12 dcb 12 performance 11 srv6 11 evpn 8 see more tags the author ivan pepelnjak ccie 1354 emeritus independent network architect at ipspace net has been designing and implementing large scale data communications networks as well as teaching and writing books about advanced internetworking technologies since 1990 more content articles presentations podcasts books shortcuts home blog even more content contact subscribe to blog posts software gone wild podcast follow ivan disclaimer the opinions expressed in individual articles blog posts videos or webinars are entirely the author s opinions read more copyright 2006 2026 ipspace net ag