diff --git a/boards/risc-v/qemu-rv/rv-virt/configs/netnsh/defconfig b/boards/risc-v/qemu-rv/rv-virt/configs/netnsh/defconfig
index f2f579e206..3f698ad38d 100644
--- a/boards/risc-v/qemu-rv/rv-virt/configs/netnsh/defconfig
+++ b/boards/risc-v/qemu-rv/rv-virt/configs/netnsh/defconfig
@@ -45,6 +45,7 @@ CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LIBC_PERROR_STDOUT=y
diff --git a/boards/risc-v/qemu-rv/rv-virt/configs/netnsh64/defconfig b/boards/risc-v/qemu-rv/rv-virt/configs/netnsh64/defconfig
index 3cac6efaa7..acc2b4ba82 100644
--- a/boards/risc-v/qemu-rv/rv-virt/configs/netnsh64/defconfig
+++ b/boards/risc-v/qemu-rv/rv-virt/configs/netnsh64/defconfig
@@ -45,6 +45,7 @@ CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LIBC_PERROR_STDOUT=y
diff --git a/boards/risc-v/qemu-rv/rv-virt/configs/netnsh_smp/defconfig b/boards/risc-v/qemu-rv/rv-virt/configs/netnsh_smp/defconfig
index c14f751738..5d43e69a65 100644
--- a/boards/risc-v/qemu-rv/rv-virt/configs/netnsh_smp/defconfig
+++ b/boards/risc-v/qemu-rv/rv-virt/configs/netnsh_smp/defconfig
@@ -45,6 +45,8 @@ CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
+CONFIG_IOB_NBUFFERS=64
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_LIBC_PERROR_STDOUT=y