Additionally, I manage to capture a traceroute from a client on the B site, to the IP range 213.13.24.0/24:
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Show posts Menutracert 213.13.24.11
Tracing route to 213.13.24.11 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms OpenWRT.lan [192.168.0.1]
2 17 ms 14 ms 15 ms 10.0.0.1
3 * * * Request timed out.
4 * * * Request timed out.
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
8 * * * Request timed out.
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
uci set firewall.lan.masq="1"
uci commit firewall
/etc/init.d/firewall restart