Support up to 3 parallel compact block txn fetchings

A single outbound slot is required, so if the first two slots
are taken by inbound in-flights, the node will reject additional
unless they are coming from outbound.

This means in the case where a fast sybil peer is attempting to
stall out a node, a single high bandwidth outbound peer can
mitigate the attack.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/net.h b/src/net.h
index 908b16f35e..83fe0427d4 100644
--- a/src/net.h
+++ b/src/net.h
@@ -200,7 +200,9 @@ public:
     int nVersion;
     std::string cleanSubVer;
     bool fInbound;
+    // We requested high bandwidth connection to peer
     bool m_bip152_highbandwidth_to;
+    // Peer requested high bandwidth connection
     bool m_bip152_highbandwidth_from;
     int m_starting_height;
     uint64_t nSendBytes;