diff --git a/netstack/src/filter/table.rs b/netstack/src/filter/table.rs
index fca87981f6..ebdab4b930 100644
--- a/netstack/src/filter/table.rs
+++ b/netstack/src/filter/table.rs
@@ -11,13 +11,14 @@
 //!
 //! ```text
 //! ACTION CHAIN [-i IFACE] [-o IFACE] [-p PROTO] [-s ADDR[/LEN]] [-d ADDR[/LEN]]
-//!              [--sport PORT] [--dport PORT]
+//!              [--sport PORT] [--dport PORT] [state STATE|--ctstate STATE[,STATE...]]
 //! ```
 //!
 //! Examples:
 //! - `ACCEPT input -p tcp --dport 80`
 //! - `DROP input -s 10.0.0.0/8`
 //! - `ACCEPT output -d 192.168.1.0/24 --sport 1024`
+//! - `ACCEPT input -p tcp --ctstate ESTABLISHED,RELATED`
 
 extern crate alloc;
 
@@ -355,13 +356,17 @@ pub fn parse_rule(line: &str) -> core::result::Result<FilterRule, ParseError> {
                 let value = tokens.next().ok_or(ParseError::Msg("missing --dport value"))?;
                 rule.dst_port = Some(parse_port(value)?);
             }
-            "state" => {
+            "state" | "--ctstate" => {
                 let value = tokens.next().ok_or(ParseError::Msg("missing state value"))?;
-                rule.state_match = Some(match value {
-                    "new" => StateMatch::New,
-                    "established" => StateMatch::Established,
-                    "related" => StateMatch::Related,
-                    "invalid" => StateMatch::Invalid,
+                // Accept comma-separated list (e.g. "ESTABLISHED,RELATED"),
+                // using the FIRST recognized state. The FilterRule struct
+                // supports a single state_match field.
+                let first = value.split(',').next().unwrap_or(value);
+                rule.state_match = Some(match first {
+                    "new" | "NEW" => StateMatch::New,
+                    "established" | "ESTABLISHED" => StateMatch::Established,
+                    "related" | "RELATED" => StateMatch::Related,
+                    "invalid" | "INVALID" => StateMatch::Invalid,
                     _ => return Err(ParseError::Msg("unknown state value")),
                 });
             }