diff --git a/ci/test-large-network.sh b/ci/test-large-network.sh
index b3ef60865f..6923f1e518 100755
--- a/ci/test-large-network.sh
+++ b/ci/test-large-network.sh
@@ -16,10 +16,20 @@ export LD_LIBRARY_PATH+=:$PWD
 
 export RUST_LOG=multinode=info
 
-if [[ $(ulimit -n) -le 65000 ]]; then
+if [[ $(ulimit -n) -lt 65000 ]]; then
   echo 'Error: nofiles too small, run "ulimit -n 65000" to continue'
   exit 1
 fi
 
+if [[ $(sysctl -n net.core.rmem_default) -lt 1610612736 ]]; then
+  echo 'Error: rmem_default too small, run "sysctl -w net.core.rmem_default 1610612736" to continue'
+  exit 1
+fi
+
+if [[ $(sysctl -n net.core.rmem_max) -lt 1610612736 ]]; then
+  echo 'Error: rmem_max too small, run "sysctl -w net.core.rmem_max 1610612736" to continue'
+  exit 1
+fi
+
 set -x
 exec cargo test --release --features=erasure test_multi_node_dynamic_network -- --ignored
diff --git a/tests/multinode.rs b/tests/multinode.rs
old mode 100755
new mode 100644
index 68be76d94e..7983fabdf8
--- a/tests/multinode.rs
+++ b/tests/multinode.rs
@@ -523,7 +523,7 @@ fn test_multi_node_dynamic_network() {
         Ok(val) => val
             .parse()
             .expect(&format!("env var {} is not parse-able as usize", key)),
-        Err(_) => 60,
+        Err(_) => 200,
     };
 
     let purge_key = "SOLANA_DYNAMIC_NODES_PURGE_LAG";