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+---
+title: Network Team Update
+slug: 2023-12-08-network
+authors: coot
+tags: [network]
+hide_table_of_contents: false
+---
+
+## High-level overview of [sprint 49][sprint-49] & [sprint 50][sprint-50]
+
+### Fixed PeerSelection bug
+
+Karl Knutsson ([Cardano Foundation (CF)][CF]) found a bug in
+the `cardano-node-8.7.0` version used on the Sancho Net which was fixed in `8.7.1`.
+It resulted in a node not being able to reconnect to an upstream peer once it
+was demoted by an asynchronous exception.  This bug would be caught by Q&A in
+a mainet release, but for testnet releases, Q&A test suite is not used. We also
+developed a test which covers the bug in the `ouroboros-network`, we also identified
+a missing `PeerSelection` test which we need to port to our simulation network.
+See [ouroboros-network#4734], [ouroboros-network#4665].
+
+### Bootstrap Peers
+
+Still under review, [ouroboros-network#4555].  The consensus team is now
+implementing the API we need for bootstrap peers.  Once consensus API is implemented we will integrate changes in an experimental branch of
+`cardano-node`.
+
+### Tx-Submission
+
+We started working on a new implementation of the tx-submission application.  No
+`tx-submission` protocol changes are foreseen, but we want to be able to
+download each `tx` from just one upstream peer and share the results between
+different connections.  We want to distribute the bandwidth between multiple
+clients.  We also think that this work will prepare us for the future
+Ouroboros-Leios changes, which will contain various versions of `tx-submission`
+like mini-protocols. See [ouroboros-network#4701].
+
+## Peer Sharing
+
+Various fixes and improvements were implemented:
+
+* [ouroboros-network#4725]
+    * disabled peer sharing with initiator-only nodes: currently it's not
+      possible to get peers from initiator-only nodes (edge nodes, e.g.
+      wallets).  In the future, we might change this, which will require running
+      a server-side of the `peer-sharing` protocol by such nodes. See
+      [ouroboros-network#4726].
+    * fixed `peer-sharing` codec
+    * fixed a handshake bug which returned a wrong peer-sharing option
+* [ouroboros-network#4728]
+    * disabled `peer-sharing` for `NodeToNodeV_11` and `NodeToNodeV_12`
+
+* Karl Knutsson ([CF]) has been working on additional improvements, e.g. [ouroboros-network#4735]
+
+With these fixes, Karl Knutsson ([CF]) was able to see that two peers on the mainnet
+can discover themselves through `peer-sharing` and keep being mutually useful
+and thus the connection surviving `outbound-governor` churn events.
+
+### IOSim
+
+We improved the memory footprint of `IOSim` in [io-sim#126], see
+[ouroboros-network#4721] for heap profile improvements on large test cases.
+
+We are working on optimising the memory footprint of `IOSimPOR`.  We are
+reimplementing `VectorClocks` using a trie, instead of a map which leads to
+significant improvements.
+
+### Cardano-Ping
+
+`cardano-node-0.2.0.10` was released to `CHaP`, [ouroboros-network#4746].  This
+version exports more APIs which turned out to be useful in `cardano-node` test
+suite, see [cardano-node#5536].
+
+### Technical Debt
+
+We addressed some small tech-debt issues in [ouroboros-network#4722]:
+* fixed some typos
+* using `bracket` instead of `onException` in `withSnocket`
+* improved haddocks
+* organised `TracePeerSelection` constructors
+
+We improved the memory footprint of some of our tests in [ouroboros-network#4721].
+
+[CF]: https://cardanofoundation.org
+[cardano-node#5536]: https://github.com/input-output-hk/cardano-node/pull/5536
+[io-sim#126]: https://github.com/input-output-hk/io-sim/pull/126
+[ouroboros-network#4555]: https://github.com/input-output-hk/ouroboros-network/pull/4555
+[ouroboros-network#4665]: https://github.com/input-output-hk/ouroboros-network/issues/4665
+[ouroboros-network#4701]: https://github.com/input-output-hk/ouroboros-network/pull/4701
+[ouroboros-network#4721]: https://github.com/input-output-hk/ouroboros-network/pull/4722
+[ouroboros-network#4722]: https://github.com/input-output-hk/ouroboros-network/pull/4722
+[ouroboros-network#4725]: https://github.com/input-output-hk/ouroboros-network/pull/4725
+[ouroboros-network#4726]: https://github.com/input-output-hk/ouroboros-network/issues/4726
+[ouroboros-network#4728]: https://github.com/input-output-hk/ouroboros-network/pull/4728
+[ouroboros-network#4734]: https://github.com/input-output-hk/ouroboros-network/pull/4734
+[ouroboros-network#4735]: https://github.com/input-output-hk/ouroboros-network/pull/4735
+[ouroboros-network#4746]: https://github.com/input-output-hk/ouroboros-network/pull/4746
+[sprint-49]: https://github.com/orgs/input-output-hk/projects/19/views/16?filterQuery=sprint%3A%22sprint+49%22
+[sprint-50]: https://github.com/orgs/input-output-hk/projects/19/views/16?filterQuery=sprint%3A%22sprint+50%22