About Harold Ritter

Harold Ritter · 07-31-2013

Hi everybody,I just received this from a customer, who thinks this might be a record uptime for a Cisco device. Anybody can beat this ;-)Regards

Harold Ritter · 01-17-2026

Hi @kaiju8 , I have worked with a multinational customer a couple of years ago. They had that problem all the time because they acquired companies on a regular basis. They initially solved that problem by using double NAT where needed, but it was pai...

Harold Ritter · 01-14-2026

It is an honor to be part of such of select group of engineers. Congratulations to all 2026 VIPs.

Harold Ritter · 01-12-2026

Hi @tarantina ,I was referring to traffic between the addresses acquired via DHCPv6. It is obviously possible to go directly from one node to another using the LLA.

Harold Ritter · 01-11-2026

Hi @daniel ng ,> so it does allow ipv4 or ipv6 only core?Well, let me rephrase it. RFC5549 is specifically for IPv4 forwarding using an IPv6 next hop. So it is not an IPv6 only core as such, as both IPv4 and IPv6 traffic can be forwarded through the ...

Harold Ritter · 01-11-2026

Hi @daniel ng ,RFC5549 allows you to deploy an IPv6 only DC underlay and transport IPv4 traffic over it. It does not require the underlay to be dual stack.The advantage to run IPv6 only in the underlay is that the configuration becomes a lot simpler ...

Member Since	‎05-07-2003 06:18 PM
Date Last Visited	‎01-01-2026 07:34 PM
Posts	8,468
Total Helpful Votes Received	10117

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Cisco Equipment Record Uptime

Re: Private overlapping addresses

Re: Welcoming and celebrating the VIP Class of 2026!

Re: ipv6 nd prefix "no-autoconfig" vs "no-advertise&quo

Re: BGP IPv4 with IPv6 next hop

Re: BGP IPv4 with IPv6 next hop