diff --git a/cargo-generate.toml b/cargo-generate.toml
index efee760..493fb1c 100644
--- a/cargo-generate.toml
+++ b/cargo-generate.toml
@@ -28,6 +28,10 @@ choices = [
 ]
 default = "xdp"
 
+[conditional.'program_type == "classifier" || program_type == "xdp"'.placeholders.default_iface]
+type = "string"
+prompt = "Which interface to attach to by default? (e.g eth0)"
+
 [conditional.'program_type == "kprobe" || program_type == "kretprobe"'.placeholders.kprobe]
 type = "string"
 prompt = "Where to attach the (k|kret)probe? (e.g try_to_wake_up)"
diff --git a/test.sh b/test.sh
index 76076ef..d9a2dd8 100755
--- a/test.sh
+++ b/test.sh
@@ -18,9 +18,15 @@ case ${PROG_TYPE} in
 "cgroup_sockopt")
   ADDITIONAL_ARGS=(-d sockopt_target=getsockopt)
   ;;
-"classifier" | "cgroup_skb")
+"cgroup_skb")
   ADDITIONAL_ARGS=(-d direction=Ingress)
   ;;
+"classifier")
+  ADDITIONAL_ARGS=(-d direction=Ingress -d default_iface=eth0)
+  ;;
+"xdp")
+  ADDITIONAL_ARGS=(-d default_iface=eth0)
+  ;;
 "fentry" | "fexit")
   ADDITIONAL_ARGS=(-d fn_name=try_to_wake_up)
   ;;
diff --git a/{{project-name}}/src/main.rs b/{{project-name}}/src/main.rs
index b558ec8..86cf0cf 100644
--- a/{{project-name}}/src/main.rs
+++ b/{{project-name}}/src/main.rs
@@ -58,7 +58,7 @@ use tokio::signal;
 struct Opt {
 {%- case program_type -%}
 {%- when "xdp", "classifier" %}
-    #[clap(short, long, default_value = "eth0")]
+    #[clap(short, long, default_value = "{{default_iface}}")]
     iface: String,
 {%- when "sock_ops", "cgroup_skb", "cgroup_sysctl", "cgroup_sockopt" %}
     #[clap(short, long, default_value = "/sys/fs/cgroup")]