Have routers output tcpdump

hole-punching-tests/Dockerfile

@@ -15,10 +15,5 @@ RUN --mount=type=cache,target=./target \
     mv ./target/x86_64-unknown-linux-musl/release/hole-punching-tests /usr/local/bin/hole-punching-tests
 
 FROM alpine:3
-
-ARG DEBIAN_FRONTEND=noninteractive
-RUN --mount=type=cache,target=/var/cache/apk apk add nftables
-
 COPY --from=builder /usr/local/bin/hole-punching-tests /usr/bin/hole-punching-tests
-
 ENV RUST_BACKTRACE=1

hole-punching-tests/router/Dockerfile

@@ -1,13 +1,9 @@
-FROM ubuntu:jammy
+FROM debian:12-slim
 
 ARG DEBIAN_FRONTEND=noninteractive
-RUN --mount=type=cache,target=/var/cache/apt apt-get update && apt-get -y install iproute2 nftables ulogd2 jq
-
-# Debugging tools
-RUN --mount=type=cache,target=/var/cache/apt apt-get update && apt-get -y install tcpdump iputils-ping
+RUN --mount=type=cache,target=/var/cache/apt apt-get update && apt-get -y install iproute2 nftables jq tcpdump
 
 COPY *.sh /scripts/
 RUN chmod +x /scripts/*.sh
-COPY ulogd.conf /etc/ulogd.conf
 
 ENTRYPOINT ["./scripts/run.sh"]

hole-punching-tests/router/run.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -ex
+set -e
 
 ADDR_EXTERNAL=$(ip -json addr show eth1 | jq '.[0].addr_info[0].local' -r)
 SUBNET_INTERNAL=$(ip -json addr show eth0 | jq '.[0].addr_info[0].local + "/" + (.[0].addr_info[0].prefixlen | tostring)' -r)
@@ -11,6 +11,4 @@ nft add rule ip nat postrouting ip saddr $SUBNET_INTERNAL oifname "eth1" snat $A
 
 tc qdisc add dev eth1 root netem delay 50ms
 
-tcpdump -i eth0 -n -w /dump.pcap &
-
-ulogd
+tcpdump -i eth1