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-rw-r--r--src/fastd.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/src/fastd.c b/src/fastd.c
index 3b8531f..af9ba6e 100644
--- a/src/fastd.c
+++ b/src/fastd.c
@@ -308,9 +308,14 @@ static void init_tuntap(fastd_context *ctx) {
if (ctl_sock < 0)
exit_errno(ctx, "socket");
- ifr.ifr_mtu = ctx->conf->mtu;
- if (ioctl(ctl_sock, SIOCSIFMTU, &ifr) < 0)
- exit_errno(ctx, "SIOCSIFMTU ioctl failed");
+ if (ioctl(ctl_sock, SIOCGIFMTU, &ifr) < 0)
+ exit_errno(ctx, "SIOCGIFMTU ioctl failed");
+
+ if (ifr.ifr_mtu != ctx->conf->mtu) {
+ ifr.ifr_mtu = ctx->conf->mtu;
+ if (ioctl(ctl_sock, SIOCSIFMTU, &ifr) < 0)
+ exit_errno(ctx, "SIOCSIFMTU ioctl failed");
+ }
if (close(ctl_sock))
pr_error_errno(ctx, "close");