Hannes Gredler
CTO at RtBrick Inc
Innsbruck, Tyrol, Austria
Summary
🤩
Rockstar🎓
Top SchoolHannes Gredler is a seasoned technology leader and CTO with 23 years of experience designing and scaling carrier-grade routing and distributed network software. He has led engineering at RtBrick to apply hyperscale principles to routing and forwarding on open hardware, and previously scaled JUNOS as a Distinguished Engineer at Juniper Networks. Deeply rooted in routing protocols, he co-chaired the IETF IS-IS working group and has hands-on contributions to libpcap, improving BPF filters and link-layer support for protocols like IS-IS and MPLS. Based in Innsbruck, Austria, he blends systems-level engineering with protocol standards work, uniquely combining product-grade software delivery with low-level packet and filtering expertise. Colleagues know him for turning network theory into practical, highly scalable implementations while keeping interoperability and operational realities front and center.
23 years of coding experience
17 years of employment as a software developer
Master Mechatronics, Master Mechatronics at University of Applied Sciences Vorarlberg (http://www.fhv.at)HTBLVA Anichstraße, Innsbruck
German, English
Github Skills (15)
c1710
protocols10
packet10
c1110
filter10
network-protocol10
bpf10
libpcap10
packet-capture9
mpls9
filtering9
ip-filter9
isis9
ppp8
ethernet7
Programming languages (3)
Github contributions (5)
the-tcpdump-group/libpcap
Oct 2002 - Mar 2011
the LIBpcap interface to various kernel packet capture mechanism
Role in this project:
Back-end Developer
Back-end DeveloperContributions:62 commits in 8 years 6 months
Contributions summary:Hannes primarily contributed to the `libpcap` library, focusing on adding and modifying code related to link-layer protocols and packet filtering. Their work involved implementing BPF (Berkeley Packet Filter) filters for various network protocols, including IS-IS, MPLS, and support for Juniper's proprietary data link types. Additionally, the user made improvements to the generation of BPF filters for existing protocols.
bpfkernelmechanismbsd-packet-filternetwork-tools
rtbrick/bgpdump2
Dec 2018 - Jul 2023
Bgpdump2: A Tool to Read and Compare the BGP RIB Dump Files.
Contributions:16 pushes, 1 branch in 4 years 7 months
bgpdumprib
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