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Subjectvlan dotQ vs 2.4.19pre8-ac5 vs big packets trouble

I try to use vlan with 2.4.19pre8-ac5 and
00:10.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M
[Tornado] (rev 74)
network card

I successfully setup vlan and got ping's (traffic)
But only with small packets

At main interface all work good
[root@watcher linux]# ping -s 1480 x.x.x.1
PING x.x.x.1 (x.x.x.1) from x.x.x.11 : 1480(1508) bytes of data.
1488 bytes from x.x.x.1: icmp_seq=1 ttl=255 time=6.93 ms
1488 bytes from x.x.x.1: icmp_seq=2 ttl=255 time=3.05 ms

--- x.x.x.1 ping statistics ---
2 packets transmitted, 2 received, 0% loss, time 1007ms
rtt min/avg/max/mdev = 3.056/4.993/6.930/1.937 ms

Vlan interface
[root@watcher linux]# ping -s 1480 x.x.x.242
PING x.x.x.242 (x.x.x.242) from x.x.x.244 : 1480(1508) bytes of data.

--- x.x.x.242 ping statistics ---
3 packets transmitted, 0 received, 100% loss, time 2017ms

Both pinged addresses in same subnet for approved interface
And vlan is work
[root@watcher linux]# ping -s 1400 x.x.x.242
PING x.x.x.242 (x.x.x.242) from x.x.x.244 : 1400(1428) bytes of data.
1408 bytes from x.x.x.242: icmp_seq=1 ttl=255 time=2.31 ms
1408 bytes from x.x.x.242: icmp_seq=2 ttl=255 time=1.79 ms

--- x.x.x.242 ping statistics ---
2 packets transmitted, 2 received, 0% loss, time 1010ms
rtt min/avg/max/mdev = 1.794/2.056/2.319/0.266 ms

I'm try to search information about this trouble found such

# My 3C59X has MTU problems.

Edit the 3C59x.c, find the place where it says:

static const int mtu = 1500;
and replace 1500 with
static const int mtu = 1504;

but I got same trouble with this patch

Best regard, Alexander Trotsai aka MAGE-RIPE aka MAGE-UANIC
My PGP at[.asc]
Big trouble - Post-it Note Sludge leaked into the monitor.
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