diff --git a/apps/gpclient/src/connect.rs b/apps/gpclient/src/connect.rs
index b6cf650c..a9fccf09 100644
--- a/apps/gpclient/src/connect.rs
+++ b/apps/gpclient/src/connect.rs
@@ -50,6 +50,8 @@ pub(crate) struct ConnectArgs {
 
   #[arg(short, long, help = "Request MTU from server (legacy servers only)")]
   mtu: Option<u32>,
+  #[arg(long, help = "Do not ask for IPv6 connectivity")]
+  disable_ipv6: bool,
 
   #[arg(long, default_value = GP_USER_AGENT, help = "The user agent to use")]
   user_agent: String,
@@ -216,6 +218,7 @@ impl<'a> ConnectHandler<'a> {
       .csd_uid(csd_uid)
       .csd_wrapper(csd_wrapper)
       .mtu(mtu)
+      .disable_ipv6(self.args.disable_ipv6)
       .build()?;
 
     let vpn = Arc::new(vpn);
diff --git a/apps/gpservice/src/vpn_task.rs b/apps/gpservice/src/vpn_task.rs
index 80fc3924..192fb8ba 100644
--- a/apps/gpservice/src/vpn_task.rs
+++ b/apps/gpservice/src/vpn_task.rs
@@ -42,6 +42,7 @@ impl VpnTaskContext {
       .csd_wrapper(args.csd_wrapper())
       .mtu(args.mtu())
       .os(args.openconnect_os())
+      .disable_ipv6(args.disable_ipv6())
       .build()
     {
       Ok(vpn) => vpn,
diff --git a/crates/gpapi/src/service/request.rs b/crates/gpapi/src/service/request.rs
index 57f37ee2..28279dcc 100644
--- a/crates/gpapi/src/service/request.rs
+++ b/crates/gpapi/src/service/request.rs
@@ -36,6 +36,7 @@ pub struct ConnectArgs {
   csd_wrapper: Option<String>,
   mtu: u32,
   os: Option<ClientOs>,
+  disable_ipv6: bool,
 }
 
 impl ConnectArgs {
@@ -48,6 +49,7 @@ impl ConnectArgs {
       csd_uid: 0,
       csd_wrapper: None,
       mtu: 0,
+      disable_ipv6: false,
     }
   }
 
@@ -78,6 +80,10 @@ impl ConnectArgs {
   pub fn mtu(&self) -> u32 {
     self.mtu
   }
+
+  pub fn disable_ipv6(&self) -> bool {
+    self.disable_ipv6
+  }
 }
 
 #[derive(Debug, Deserialize, Serialize, Type)]
@@ -109,11 +115,6 @@ impl ConnectRequest {
     self
   }
 
-  pub fn with_mtu(mut self, mtu: u32) -> Self {
-    self.args.mtu = mtu;
-    self
-  }
-
   pub fn with_user_agent<T: Into<Option<String>>>(mut self, user_agent: T) -> Self {
     self.args.user_agent = user_agent.into();
     self
@@ -124,6 +125,16 @@ impl ConnectRequest {
     self
   }
 
+  pub fn with_mtu(mut self, mtu: u32) -> Self {
+    self.args.mtu = mtu;
+    self
+  }
+
+  pub fn with_disable_ipv6(mut self, disable_ipv6: bool) -> Self {
+    self.args.disable_ipv6 = disable_ipv6;
+    self
+  }
+
   pub fn gateway(&self) -> &Gateway {
     self.info.gateway()
   }
diff --git a/crates/openconnect/src/ffi/mod.rs b/crates/openconnect/src/ffi/mod.rs
index aa5a4a37..cdae0196 100644
--- a/crates/openconnect/src/ffi/mod.rs
+++ b/crates/openconnect/src/ffi/mod.rs
@@ -20,6 +20,7 @@ pub(crate) struct ConnectOptions {
   pub csd_wrapper: *const c_char,
 
   pub mtu: u32,
+  pub disable_ipv6: u32,
 }
 
 #[link(name = "vpn")]
diff --git a/crates/openconnect/src/ffi/vpn.c b/crates/openconnect/src/ffi/vpn.c
index e1f6c698..d5b83433 100644
--- a/crates/openconnect/src/ffi/vpn.c
+++ b/crates/openconnect/src/ffi/vpn.c
@@ -64,6 +64,7 @@ int vpn_connect(const vpn_options *options, vpn_connected_callback callback)
     INFO("CSD_USER: %d", options->csd_uid);
     INFO("CSD_WRAPPER: %s", options->csd_wrapper);
     INFO("MTU: %d", options->mtu);
+    INFO("DISABLE_IPV6: %d", options->disable_ipv6);
 
     vpninfo = openconnect_vpninfo_new(options->user_agent, validate_peer_cert, NULL, NULL, print_progress, NULL);
 
@@ -103,6 +104,10 @@ int vpn_connect(const vpn_options *options, vpn_connected_callback callback)
         openconnect_set_reqmtu(vpninfo, mtu);
     }
 
+    if (options->disable_ipv6) {
+        openconnect_disable_ipv6(vpninfo);
+    }
+
     g_cmd_pipe_fd = openconnect_setup_cmd_pipe(vpninfo);
     if (g_cmd_pipe_fd < 0)
     {
diff --git a/crates/openconnect/src/ffi/vpn.h b/crates/openconnect/src/ffi/vpn.h
index 58c52f00..d2e8b58c 100644
--- a/crates/openconnect/src/ffi/vpn.h
+++ b/crates/openconnect/src/ffi/vpn.h
@@ -21,6 +21,8 @@ typedef struct vpn_options
     const char *csd_wrapper;
 
     const int mtu;
+
+    const int disable_ipv6;
 } vpn_options;
 
 int vpn_connect(const vpn_options *options, vpn_connected_callback callback);
@@ -35,7 +37,7 @@ static char *format_message(const char *format, va_list args)
     int len = vsnprintf(NULL, 0, format, args_copy);
     va_end(args_copy);
 
-    char *buffer = malloc(len + 1);
+    char *buffer = (char*)malloc(len + 1);
     if (buffer == NULL)
     {
         return NULL;
diff --git a/crates/openconnect/src/vpn.rs b/crates/openconnect/src/vpn.rs
index e5f32805..bb2040f8 100644
--- a/crates/openconnect/src/vpn.rs
+++ b/crates/openconnect/src/vpn.rs
@@ -24,6 +24,7 @@ pub struct Vpn {
   csd_wrapper: Option<CString>,
 
   mtu: u32,
+  disable_ipv6: bool,
 
   callback: OnConnectedCallback,
 }
@@ -68,6 +69,7 @@ impl Vpn {
       csd_wrapper: Self::option_to_ptr(&self.csd_wrapper),
 
       mtu: self.mtu,
+      disable_ipv6: self.disable_ipv6 as u32,
     }
   }
 
@@ -110,6 +112,7 @@ pub struct VpnBuilder {
   csd_wrapper: Option<String>,
 
   mtu: u32,
+  disable_ipv6: bool,
 }
 
 impl VpnBuilder {
@@ -126,6 +129,7 @@ impl VpnBuilder {
       csd_wrapper: None,
 
       mtu: 0,
+      disable_ipv6: false,
     }
   }
 
@@ -159,6 +163,11 @@ impl VpnBuilder {
     self
   }
 
+  pub fn disable_ipv6(mut self, disable_ipv6: bool) -> Self {
+    self.disable_ipv6 = disable_ipv6;
+    self
+  }
+
   pub fn build(self) -> Result<Vpn, VpnError> {
     let script = match self.script {
       Some(script) => {
@@ -188,6 +197,7 @@ impl VpnBuilder {
       csd_wrapper: self.csd_wrapper.as_deref().map(Self::to_cstring),
 
       mtu: self.mtu,
+      disable_ipv6: self.disable_ipv6,
 
       callback: Default::default(),
     })