diff --git a/netfetch/Cargo.toml b/netfetch/Cargo.toml
index 3a243ad..56484a2 100644
--- a/netfetch/Cargo.toml
+++ b/netfetch/Cargo.toml
@@ -35,6 +35,7 @@ stats = { path = "../stats" }
 scywr = { path = "../scywr" }
 dbpg = { path = "../dbpg" }
 ingest-linux = { path = "../ingest-linux" }
+slidebuf = { path = "../slidebuf" }
 err = { path = "../../daqbuffer/crates/err" }
 netpod = { path = "../../daqbuffer/crates/netpod" }
 items_0 = { path = "../../daqbuffer/crates/items_0" }
diff --git a/netfetch/src/ca/findioc.rs b/netfetch/src/ca/findioc.rs
index ddfeaa3..d8468ee 100644
--- a/netfetch/src/ca/findioc.rs
+++ b/netfetch/src/ca/findioc.rs
@@ -279,7 +279,7 @@ impl FindIocStream {
                 error!("received packet too large");
                 panic!();
             }
-            let mut nb = crate::netbuf::NetBuf::new(2048);
+            let mut nb = slidebuf::SlideBuf::new(2048);
             nb.put_slice(&buf[..ec as usize]).map_err(|e| e.to_string())?;
             let mut msgs = Vec::new();
             let mut accounted = 0;
diff --git a/netfetch/src/ca/proto.rs b/netfetch/src/ca/proto.rs
index 802d58d..233ddad 100644
--- a/netfetch/src/ca/proto.rs
+++ b/netfetch/src/ca/proto.rs
@@ -1,11 +1,11 @@
 use crate::netbuf;
-use crate::netbuf::NetBuf;
 use err::thiserror;
 use err::ThisError;
 use futures_util::pin_mut;
 use futures_util::Stream;
 use log::*;
 use netpod::timeunits::*;
+use slidebuf::SlideBuf;
 use std::collections::BTreeMap;
 use std::collections::VecDeque;
 use std::io;
@@ -23,37 +23,23 @@ use tokio::net::TcpStream;
 
 #[derive(Debug, ThisError)]
 pub enum Error {
-    #[error("{0}")]
     NetBuf(#[from] netbuf::Error),
+    SlideBuf(#[from] slidebuf::Error),
     #[error("BufferTooSmallForNeedMin({0}, {1})")]
     BufferTooSmallForNeedMin(usize, usize),
-    #[error("IO({0})")]
     IO(#[from] io::Error),
-    #[error("BadSlice")]
     BadSlice,
-    #[error("BadCaDbrTypeId({0})")]
     BadCaDbrTypeId(u16),
-    #[error("BadCaScalarTypeId({0})")]
     BadCaScalarTypeId(u16),
-    #[error("GetValHelpInnerTypeMismatch")]
     GetValHelpInnerTypeMismatch,
-    #[error("GetValHelpTodoWaveform")]
     GetValHelpTodoWaveform,
-    #[error("NotEnoughPayload")]
     NotEnoughPayload,
-    #[error("TodoConversionArray")]
     TodoConversionArray,
-    #[error("CaProtoVersionMissing")]
     CaProtoVersionMissing,
-    #[error("NotEnoughPayloadTimeMetadata({0})")]
     NotEnoughPayloadTimeMetadata(usize),
-    #[error("MismatchDbrTimeType")]
     MismatchDbrTimeType,
-    #[error("BadCaCount")]
     BadCaCount,
-    #[error("CaCommandNotSupported({0})")]
     CaCommandNotSupported(u16),
-    #[error("ParseAttemptInDoneState")]
     ParseAttemptInDoneState,
 }
 
@@ -906,7 +892,7 @@ pub struct HeadInfo {
 }
 
 impl HeadInfo {
-    pub fn from_netbuf(buf: &mut NetBuf) -> Result<Self, Error> {
+    pub fn from_netbuf(buf: &mut SlideBuf) -> Result<Self, Error> {
         let command = buf.read_u16_be()?;
         let payload_size = buf.read_u16_be()?;
         let data_type = buf.read_u16_be()?;
@@ -957,8 +943,8 @@ pub struct CaProto {
     tcp: TcpStream,
     remote_addr_dbg: SocketAddrV4,
     state: CaState,
-    buf: NetBuf,
-    outbuf: NetBuf,
+    buf: SlideBuf,
+    outbuf: SlideBuf,
     out: VecDeque<CaMsg>,
     array_truncate: usize,
     logged_proto_error_for_cid: BTreeMap<u32, bool>,
@@ -970,8 +956,8 @@ impl CaProto {
             tcp,
             remote_addr_dbg,
             state: CaState::StdHead,
-            buf: NetBuf::new(1024 * 128),
-            outbuf: NetBuf::new(1024 * 128),
+            buf: SlideBuf::new(1024 * 128),
+            outbuf: SlideBuf::new(1024 * 128),
             out: VecDeque::new(),
             array_truncate,
             logged_proto_error_for_cid: BTreeMap::new(),
@@ -982,8 +968,10 @@ impl CaProto {
         self.out.push_back(item);
     }
 
-    fn inpbuf_conn(&mut self, need_min: usize) -> (&mut TcpStream, ReadBuf) {
-        (&mut self.tcp, self.buf.read_buf_for_fill(need_min))
+    fn inpbuf_conn(&mut self, need_min: usize) -> Result<(&mut TcpStream, ReadBuf), Error> {
+        let buf = self.buf.available_writable_area(need_min)?;
+        let buf = ReadBuf::new(buf);
+        Ok((&mut self.tcp, buf))
     }
 
     fn outbuf_conn(&mut self) -> (&mut TcpStream, &[u8]) {
@@ -992,10 +980,12 @@ impl CaProto {
 
     fn out_msg_buf(&mut self) -> Option<(&CaMsg, &mut [u8])> {
         if let Some(item) = self.out.front() {
-            if let Ok(buf) = self.outbuf.write_buf(item.len()) {
-                Some((item, buf))
-            } else {
-                None
+            match self.outbuf.available_writable_area(item.len()) {
+                Ok(buf) => Some((item, buf)),
+                Err(_) => {
+                    // TODO is this the correct behavior?
+                    None
+                }
             }
         } else {
             None
@@ -1031,11 +1021,13 @@ impl CaProto {
                 break None;
             }
             while let Some((msg, buf)) = self.out_msg_buf() {
-                if msg.len() > buf.len() {
+                let msglen = msg.len();
+                if msglen > buf.len() {
                     error!("got output buffer but too small");
                     break;
                 } else {
                     msg.place_into(buf);
+                    self.outbuf.wadv(msglen)?;
                     self.out.pop_front();
                 }
             }
@@ -1068,7 +1060,7 @@ impl CaProto {
                 let e = Error::BufferTooSmallForNeedMin(self.buf.cap(), self.state.need_min());
                 Err(e)
             } else if self.buf.len() < need_min {
-                let (w, mut rbuf) = self.inpbuf_conn(need_min);
+                let (w, mut rbuf) = self.inpbuf_conn(need_min)?;
                 pin_mut!(w);
                 match w.poll_read(cx, &mut rbuf) {
                     Ready(k) => match k {